could you calculate 4C-21 for me ? (C : combination)
2006-09-09 03:31:33 · 9 answers · asked by Anonymous in Education & Reference ➔ Homework Help
It' s a culculation you use to solve probability in math. C is not substitute for any number.
2006-09-09 03:44:12 · update #1
I mean I don't know how to calculate combination when the number which is right to C is minus.
2006-09-09 04:07:00 · update #2
the whole question is like this
a group of 25 people is going to decide a leader. 4 people ran.When the 25 people vote without writing his or her name, how many pattern of break up can be thought?
2006-09-09 04:14:15 · update #3
the 4 people can vote for themselves.
2006-09-10 02:29:26 · update #4
This should help you.
http://www.codeproject.com/cpp/CombC.asp
Combination is the way of picking a different unique smaller set from a bigger set, without regard to the ordering (positions) of the elements (in the smaller set). First, your showed the technique to find combinations. Next, your explained how to use source code. The source includes a recursive template version and a non-recursive template version. At the end, you are showed how to find permutations of a smaller set from a bigger set, using both next_combination() and next_permutation().
2006-09-09 04:49:24 · answer #1 · answered by Excel 5 · 0⤊ 0⤋
something is missing from your problem....
correct it and I'll help you...
I know what a combination is! But it's usually written as 4C2 or 4C3...
There is something missing or just typed incorrectly!
It cannot be 4C(-21) because you can't have a negative number as part of a combination...so what is it?!?!?
You said there was a group of 25 that was going to choose a leader, and that 4 were running. Since you had the number 21 somewhere, I'm assuming that those 4 people were in the group of 25. You said that all 25 would be voting, so can the 4 people running vote for themselves? Please clarify.
2006-09-09 10:37:42 · answer #2 · answered by q_midori 4 · 0⤊ 0⤋
Do you mean 21 choose 4?
Answer is 5985. My calculator says math error for 4 choose 21.
2006-09-09 10:49:14 · answer #3 · answered by _ 2 · 0⤊ 0⤋
heyz.. C is stands for combinations. if you see your calculator, you'll either find "nCr" or "C". It is a valid question in this sense.
Yet, considering the form nCr, the condition is that n>r and that r>0, so the question is not valid in this sense.
Btw, for those who do not know, in nCr,
nCr = n!/((n-r)!r!), exclaimation marks means to factorial the number before that.
2006-09-09 11:39:15 · answer #4 · answered by vicks 2 · 0⤊ 0⤋
cannot calculate your expression with knowing the value for "c"
example: c=2
4c - 21
4(2) - 21
8 - 21
-13
example: c = -3
4c - 21
4(-3) - 21
-12 - 21
-33
you must know the value for "c" and then input it in your expression
2006-09-09 10:40:08 · answer #5 · answered by Anonymous · 0⤊ 1⤋
Are you sure you typed in the entire problem? In order to see what C equals, you need a solution to the equation.
2006-09-09 10:39:23 · answer #6 · answered by smartee 4 · 0⤊ 1⤋
AND C is equal to?????
Q incomplete. marks deducted 5
2006-09-09 10:51:45 · answer #7 · answered by Ewnet 3 · 0⤊ 1⤋
ask the teacher.
2006-09-09 10:33:47 · answer #8 · answered by ♥Brittany♥ 6 · 0⤊ 2⤋
It's your homework,you do it
2006-09-09 10:33:19 · answer #9 · answered by Anonymous · 0⤊ 2⤋