Given the b= [1,2,3,4}, how many subsets have exactly two elements

6

{1, 2}, {1, 3}, {1, 4}, {2, 3}, {2, 4}, {3, 4}

6

Step-by-step explanation:

We are given that a set b={1,2,3,4}

We have to find number of subsets which contain exactly two elements.

Combination formula

We have n=4, r=2

Using the combination formula

=6

Subsets of given set which contain exactly two elements={1,2},{2,3},{3,4},{1,3},{1,4},{2,4}

Hence, 6 subsets of  a set which contain exactly two elements.

how many players are there?

step-by-step explanation:

i am unable to solve this problem

step-by-step explanation: