SOLUTION: I have worked out this problem, but it doesn't look right to me. Could you see what I have done wrong please. directions: Evaluate C(12,10) C(12,10)=12!/(12-10)! C(12,10)=12!/

Question 169228: I have worked out this problem, but it doesn't look right to me. Could you see what I have done wrong please.
directions: Evaluate C(12,10)
C(12,10)=12!/(12-10)!
C(12,10)=12!/2!
C(12,10)=(1*2*3*4*5*6*7*8*9*10*11*12)/(1*2)
C(12,10)=3*1*5*6*7*8*9*10*11*12
C(12,10)=239,500,800
Will you please show me if I did something wrong. This looks like to big of a number
Thank you
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
You forgot the "r!" in the denominator.
C(n,r) = n!/(r!(n-r)!)
C(12,10) = 12!/(10!(12-10)!)
C(12,10) = 12!/(10!(2)!)
C(12,10) = (11*12)/(1*2)
C(12,10) = 132/2
C(12,10) = 66

RELATED QUESTIONS
I have no idea what i am doing wrong, could you please help me. The directions say:... (answered by Earlsdon)

A terrorist needs to mix some 2% acid. She has on hand 50 mL of a 1% solution and some 4% (answered by KnightOwlTutor)

This problem stumped me last night and tried to work it out but have no clue how I... (answered by solver91311)

Ok so i've done this problem at least 20 times and i don't know what i am doing wrong!... (answered by stanbon)

I have already worked this problem, but think I got confused and mixed up a couple of... (answered by Earlsdon,jim_thompson5910)

The problem I am trying to figure out is: (a-2)^2=8 I have to use the square root... (answered by Alan3354)

Solve the equation 4^2x+1=2^3x+6. I have no answer for this one but I didn't try.... (answered by stanbon)

When i worked this problem, the graph did not turn out right. The equation is... (answered by rapaljer)

My math problem is: 6.25 kg is how many ounces? Can you help me solve this problem, I... (answered by josgarithmetic)