Police composite

Number Theory Level 1

How many of the following 10 numbers are composite:

1 2 3 4 5 21 22 23 24 25 \begin{array} { l l l l l} 1 & 2 & 3 & 4 & 5 \\ 21 & 22 & 23 & 24 & 25 \\ \end{array}


The answer is 5.

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Arron Kau by Arron Kau

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1 solution

Arron Kau Staff
May 13, 2014

The numbers 4, 21, 22, 24, 25 are composite. There are 5 of them.

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