Question

17 × 11 × 13 + 11 is ______.

Options

• a prime number.

• multiple of 17.

• a composite number.

• an odd number.

Answer 1

17 × 11 × 13 + 11 is a composite number.

Explanation:

17 × 11 × 13 + 11 = 11 × (17 × 13 + 1) 

= 11 × (221 + 1) 

= 11 × 222 

= 2442

So, it has nontrivial factors e.g., 11 and 222 and is composite.