What is 5c2 it is in combinations for high school.

5C2 is asking how many combinations of 2 can be made out of 5 items.

The formula to solve this is:

C(n,r) = n! / (r!(n-r)!)

N is the number of items and r is the sample

Replace n and r and solve:

5! / (2!(5-2)!)

a number with an exclamation point, means to multiply that number by all the numbers below it.

5! = 5 *4 *3 *2 *1 = 120

2! = 2*1 =2

5-2 = 3

3! = 3*2*1 = 6

Now you have 120 / 2*6 = 120/12 = 10

The answer is 10.