Question

Given that B = {1, 2, 3, 4}, how many subsets have exactly two elements?

Answer 1

6

Explanation:

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

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

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

Remove duplicates {2,1}, {3,1}, {4,1}, {3,2}, {4,2}, {4,3}

Final Answer = 6 subsets remain

Answer 2

The answer is 6

There are 6 subsets that have exactly two elements