Question

Find the cardinal number for the set.A = {6, 12, 18,..., 42}a.) The set is infinite.b.) n(A) = 4c.) n(A) = 42d.) n(A) = 7

Answer 1

Let's compelete the following set: A = {6, 12, 18,..., 42}

It appears that the set has a common difference of 6. Thus, we get:

A = {6, 12, 18,..., 42}

A = {6, 12, 18, 24, 30, 36, 42}

1 2 3 4 5 6 7

Therefore, the cardinal number of the given set is 7.

The answer is letter D.