Mathematics - 14 August 2006

Three Englishmen and three Frenchmen work for the same company.Each of them knows a secret not known to others.They need to exchange these secrets over person-to-person phone calls so that eventually each person knows all six secrets.None of the Frenchmenknows English, and only one Englishman knows French.What is the minimum number of phone calls needed for the above purpose?
(a) 5
(b) 10
(c) 9
(d) 15

2006-08-14 23:47:05 · 9 answers · asked by Rohit C 3

The diameter of the circle is 3 cm.AB(horizontally drawn) and MN(vertically drawn) are two diameters such that MN is perpendicular to AB.In addition,CG is perpendicular to AB such that AE : EB=1 : 2,and DF is perpendicular to MN such that NL : LM=1 : 2.C,G,D and F are on the circumference of the circle.CG is drawn to the left of MN and DF is drawn below AB.The length of DH in cm is
(a) 2*sqrt(2)-1
(b) (2*sqrt(2)-1)/2
(c) (3*sqrt(2)-1)/2
(d) (2*sqrt(2)-1)/3

2006-08-14 23:40:17 · 3 answers · asked by Rohit C 3

Rectangular tiles each of size 70 cm by 30 cm must be laid horizontally on a rectangular floor of size 110cm by 130cm such that the tiles donot overlap. A tile can b placed in any orientation so long as its edges are parallel to the edges of the floor. No tile should overshoot any edge of the floor. The maximum number of tiles that can b accomodated on the floor is
(a) 4
(b) 5
(c) 6
(d) 7
The answer is 6 but how?

2006-08-14 23:27:17 · 3 answers · asked by Rohit C 3

In a chess competition involving some boys and girls of a school,every student had to play exactly one game with every other student.It was found that in 45 games both the players were girls, and in 190 games both were boys.The number of games in which one player was a boy and the other was a girl is
(a) 200
(b) 216
(c) 235
(d) 256

2006-08-14 23:24:43 · 8 answers · asked by Rohit C 3

For which value of k does the following pair of equations yield a unique solution for x such that the solution is positive?
x^2 - y^2 = 0
(x-k)^2 + y^2 = 1
(a) 2
(b) 0
(c) sqrt(2)
(d) -sqrt(2)

2006-08-14 23:17:43 · 4 answers · asked by Rohit C 3

http://www.click2amuse.com/fun/optical/opt.php?ID=37 <<< thats the link, IF ANYBODY WORKS THIS OUT PLEASE TELL ME!!!!

2006-08-14 22:29:53 · 21 answers · asked by PAulio -- 2

2006-08-14 21:47:34 · 13 answers · asked by Omar 1

Two bags each contain 3 red, 3 white and 3 blue marbles. Without looking, someone removes from the first bag the LARGEST number of marbles that it is possible to remove while still being sure that at least one of each colour remains. These marbles are put into the second bag. He now transfers back (without looking of course) the SMALLEST possible number of marbles that will assure there being at least 2 of each colour in the first bag.

How many marbles remain in the second bag?

2006-08-14 21:40:11 · 24 answers · asked by brainyandy 6

2006-08-14 21:33:25 · 6 answers · asked by gemini_sam2000 1

http://i2.photobucket.com/albums/y16/zorro1267/exponent.gif

It diverges because there are an infinite number of equations one can form from it.

2006-08-14 20:26:32 · 9 answers · asked by z_o_r_r_o 6

One day, Caroline decides to leave her cruel husband and went to stay in a womans reguge close by to Lake Round; so called because it is a perfect circle. However, her husband follows her there . To escape, she takes the only rowing boat and rows to the centre of the lake which is marked with a buoy. Her husband is furious but, knowing she would have to come ashore eventually, decided to wait for her on the edge of the lake. He assumed that because he could run 4 times faster than she could row, it would be simple for him to catch her when she reached the edge of the lake. But Caroline was also giving this some thought. She new she could out-run him when she got ashore so she devised a plan that got her ashore before he could get there.

What was her strategy? You can assume that at all times she new her exact position on the lake.

2006-08-14 20:21:04 · 15 answers · asked by brainyandy 6

Using Integration by Parts...
Mine just seemed to go in circles..please help.

2006-08-14 20:08:20 · 7 answers · asked by Jordan 1

would i take 3a-31-7?..

2006-08-14 20:00:37 · 15 answers · asked by sugar_123000 1

2006-08-14 19:50:00 · 12 answers · asked by Anonymous

x=2
x(x-1)=2(x-1)
x^2-x=2x-2
x^2-2x=x-2
x(x-2)=x-2
x=1

clearly x cannot equal 1 and 2 (thus 1=2).

Im not entirly certain why this works out this way, but I assume that multiplying the equation by (x-1) changed something but I cannot figure out what.

2006-08-14 19:29:13 · 9 answers · asked by bob o 2

if anything over itself is 1
if anything over 0 is underfined
if 0 over anything is zero
what is zero over zero

2006-08-14 19:04:12 · 17 answers · asked by mrada6 2

y= -3x + 9

2006-08-14 18:57:37 · 9 answers · asked by sonovabeeech 1

2006-08-14 18:49:50 · 5 answers · asked by Anonymous

Let x=sqrt(4+sqrt(4-sqrt(4+sqrt(4-...to infinity.Then x equals
(a) 3
(b) (sqrt(13)-1)/2
(c) (sqrt(13)+1)/2
(d) sqrt(13)

2006-08-14 18:40:50 · 9 answers · asked by Rohit C 3

Let g(x) be a function such that g(x+1) + g(x-1)=g(x) for every real x.Then for what value of p is the relation g(x+p)=g(x) necessarily true for every real x?
(a) 5
(b) 3
(c) 2
(d) 6

2006-08-14 18:35:15 · 4 answers · asked by Rohit C 3

Between 1992 and 1999, you added approximately 15 stamps per year to your collection. In 1997 you had 130 stamps. Find an equation that represents the number of stamps in your collection, y, in terms of the year, t. Let t=0 correspnd to 1992.

2006-08-14 18:14:42 · 5 answers · asked by sonovabeeech 1

I don't want to hear that it's an intractable problem and cannot be solved. I want one of you smart people out there to DO it. Or at least give us your best strategy/theory/idea.

PS It will earn you 10 points. Remember, protractor and straight-edge only.

2006-08-14 17:58:18 · 8 answers · asked by iandanielx 3

Here 'alpha' is denoted by '@'.

2006-08-14 17:53:10 · 4 answers · asked by Anonymous

A rectangular floor is fully covered with square tiles of identical size.The tiles on the edge are white and the tiles in the interior are red. the number of white tiles is the same as the number of red tiles. a possible value of the number of tiles along one edge of the floor is
(a) 10
(b) 12
(c) 14
(d) 16

2006-08-14 17:52:09 · 5 answers · asked by Rohit C 3

Let x-=sqrt(4+sqrt(4+sqrt(4+...to infinity.Then x equals
(a) 3
(b) (sqrt(13)-1)/2
(c) (sqrt(13)+1)/2
(d) sqrt(13)

2006-08-14 17:47:02 · 6 answers · asked by Rohit C 3

can't find an answer from any of his teachers even those who teach higher math .

2006-08-14 17:11:35 · 14 answers · asked by bettyvbell 1

2006-08-14 17:07:13 · 5 answers · asked by Anonymous

By worlds largest number(s), I mean the largest number(s) that have ever been used in mathematical proofs (which is the accepted definition). Try to make these generally unfathomable numbers understandable.

10 points for best description (using infinity is not allowed).

2006-08-14 17:02:53 · 11 answers · asked by iandanielx 3

2006-08-14 16:57:12 · 12 answers · asked by pritam s 1

2006-08-14 16:43:32 · 6 answers · asked by sandy v 1