Question

Which of the following is acomposite number?Enter a, b, c, d, or e.a. 29b. 37C. 57d. 41e. 31

Answer 1

Solution:

Composite numbers are numbers with more than two factors. They are divisible by more than two numbers.

Given the numbers:

$29,\text{ 37, 57, 41, 31}$$\begin{gathered} \Rightarrow29\text{ is not a composite number since it has only 2 factors \lparen1 and 29\rparen.} \\ \Rightarrow37\text{ is not a composite number since it has only 2 factors \lparen1 and 37\rparen.} \\ \Rightarrow57\text{ is divisible by 1, 3, 19, and 57. Thus, it's a composite number.} \\ \Rightarrow41\text{ is not a composite number since it has only 2 factors \lparen1 and 41\rparen.} \\ \Rightarrow31\text{ is not a composite number since it has only 2 factors \lparen1 and 31\rparen.} \end{gathered}$

Hence, 57 is a composite number.

The correct option is C.