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This is an example of Combination. Combination is a number of ways of selecting r items from a set of n. This can be denoted as nCr = n!/r!(n-r)!

It doesn't specify here what color of the ball we will be drawn from a box and there are total of 13 balls in a box. So, there will 13C2 ways of drawing a ball from a box. Let's try to solve this. nCr = n!/r!(n-r)! 13C2 = 13! / 2!(13-2)! = 13! / 2!(11!) = (13×12×11!) / (2×1×11!) = (13×12) / (2×1) = 156 / 2 13C2 = 78 ways

Therefore, there are 78 ways that the 2 balls can be drawn from a box containing 7 red and 6 green balls.

In statistics, this is called combination wherein order doesn't matter! the formula is: C= where: n=total number of objects r=number of objects you need or if you have studied about permutation: C= Get the total # of balls: 7+6=13

substitute: C= C= Cancel out the 11! and divide 12 by 2 now you have: C=13x6 C=78 or just input at the calculator 13C2 and its the same =) Hope this helps =)!