Question

I have 20 different balloons numbered from 1 to 20.

A. If I randomly split the balloons to pairs, when the order is not important,

What is the probability that in exactly 2 pairs of balloons there won't be an even balloon​

Answer 1

Answer:

10 pair of balloons will be there if we are making 1 pair of each from 20 balloons.

But,

5 pair of balloons will be made from each 4 balloons if we are making 2 pairs of each.

Because 1 pair contains 2 objects so,

2 pairs will contain 4.

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