How many subsets of exactly two elements does a set of five elements have? a.10 b.26 c.7 d.32

Option: A is the correct answer.

                A. 10

We know that the number of subsets of exactly ''r'' elements that is formed by the help of n elements is calculated by:

Since here we have to chose 2 elements out of the 5 elements in order to form a subset.

Hence, we have:   n=5 and r=2

Hence, the number of subsets are:

Hence, the number of subsets are:

                                   10

yes yes yes yes yes yes yes yes yes

hi! i think the answer is 1/2 : )