Question 39

Which of the following numbers is not composite?

Solution

A positive integer $$n$$ is a composite number if it has factors other than 1 and itself.

A positive integer $$n$$ is a prime number if it has only two factors (1 and itself).

209 is composite no whose factor are 1,11,19,209

203 is composite no. whose factor are 1,7,29,203

161 is composite no. whose factor are 1,7,23,161

109 is not composite no, whose factor are 1,109 only

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