Question

give the answer, which of the following are composite numbers? 4 9 15 3 5

Answer 1

Given

we are given numbers 4, 9, 15, 3, 5

Required

we need to find which of the above numbers are composite.

Explanation

Here

$\begin{gathered} 4=2\times2 \\ 9=3\times3 \\ 15=3\times5 \\ 3=3\times1 \\ 5=5\times1 \end{gathered}$

clearly 4, 9, 15 have factors other than 1 and itself.

so 4, 9 and 15 are composite numbers