Question

Express each set using the roster method.

A. The set of natural odd numbers greater than 2, but less than 11.
B. {x|x€N and 4

Answer 1

A. { 3, 4, 5, 6, 7, 8, 9, 10}

B. {4}

Explanation:

A. { 3, 4, 5, 6, 7, 8, 9, 10}

⇒ We didn't include 2 in this because 2 = 2, not greater than 2.

⇒ We also didn't include 11 for the same reason. 11 = 11, not less than 11.

B. First of all, this tells us that x is a natural number, i.e. x ≥ 1

The second thing it tells us is that x = 4. So the answer is {4}

(I may have misunderstood B. If I'm not correct, I'm really sorry. )