Which of the following is a prime number-7-9-15-21-

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Prime numbers

Which of the ...

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Which of the following is a prime number?

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Question 5 (b)

Which of the following numbers are co-prime:
15 and 37

Which of the following numbers are not prime ?

$2, 6, 14, 19, 11, 09, 13, 21, 10, 15, 5$

24, 22, 23, 14, 15, 7, 21

17, 15, 9, 13, 21, 32, 42, 7, 12, 10

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