answers:
1
66
122
2050
2007-03-04 04:44:26 · 11 answers · asked by hihn c 1 in Science & Mathematics ➔ Mathematics
66.
12! can be rewritten as 12*11*10!, so the whole problem can be rewritten as:
(12*11*10!)/(2*10!)
Factoring out the 10! from the numerator and denominator you get:
12*11/2 = 122/2 = 66
2007-03-04 04:46:58 · answer #1 · answered by superguytim 3 · 2⤊ 0⤋
This is a factorial problem. First, the thing you need to remember is that since 2! and 10! are together, it means you multiply them. Now, let me show you how to lay it out.
12!
-------- =
2!10!
12*11*10*9*8*7*6*5*4*3*2*1
--------------------------------------
2*1*10*9*8*7*6*5*4*3*2*1
Now, to make this easy, we need to remember that if the same number is on the top and bottom of a multiplication problem, we can cancel it out. So, since 10! (10*9*8*7*6*5*4*3*2*1) is on the top and bottom, we can cancel out all of those numbers on the top and bottom. We are then left with this:
12*11
--------
2
Now, 12*11 is 132. We then have:
132/2=66
Therefore, the answer is 66. We also can be assured of this even further because it is one of the possible answers to this question that is given up top. So, your answer is 66.
There you go. I'm glad I could help. :)
2007-03-04 09:08:02 · answer #2 · answered by iamanicecaringfriend 3 · 0⤊ 0⤋
66 easy when you think that 12!/10! =11*12 =132 divide by 2!
Answer 66
2007-03-04 04:56:04 · answer #3 · answered by maussy 7 · 1⤊ 0⤋
66
2007-03-04 04:47:34 · answer #4 · answered by brian_holinsworth1 2 · 1⤊ 0⤋
66
2007-03-04 04:47:01 · answer #5 · answered by Anonymous · 1⤊ 0⤋
12!/2!10! =
12 * 11 * 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1
___________________________________
2 * 1 * 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1
everything cancels out except(
(12 * 11) / (2 * 1)
which = 66
:)
2007-03-04 04:55:24 · answer #6 · answered by stephanie jean 1 · 1⤊ 0⤋
66 if the question is (12!)/(2!10!)
2007-03-04 04:47:42 · answer #7 · answered by Milo 4 · 1⤊ 0⤋
I assume you mean 12! / (2! 10!)
well, 12!/10! = 12 * 11. 2 ! = 2. So, the rest is pretty easy.
2007-03-04 04:47:52 · answer #8 · answered by doctor risk 3 · 1⤊ 1⤋
66 for sure that is the right answer to me anyways...
2007-03-04 04:49:21 · answer #9 · answered by geostrom b 4 · 0⤊ 0⤋
This is the same as ncr(12,2) = 66
2007-03-04 04:53:15 · answer #10 · answered by leo 6 · 0⤊ 0⤋