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If A={1, 2, 3, 4}, then the number of the subsets of A that contain the element 2 but not 3, is?a.24b.16c.8d.4

Question

If A={1, 2, 3, 4}, then the number of the subsets of A that contain the element 2 but not 3, is?

  • a. 24
  • b. 16
  • c. 8
  • d. 4
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Solution

The set A={1, 2, 3, 4} has 4 elements. We are looking for subsets that contain the element 2 but not 3.

This means we are essentially looking at a "new" set {1, 2, 4} of 3 elements (we've removed the 3 from consideration).

The number of subsets of a set with n elements is 2^n.

So, the number of subsets of our "new" set is 2^3 = 8.

Therefore, the number of subsets of A that contain the element 2 but not 3 is 8.

So, the answer is c. 8.

This problem has been solved

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