hi guys i need help with my maths problems

Mathematics
Tutor: None Selected Time limit: 1 Day

Which one of the following is not a prime number?

A.31B.61
C.71D.91
Jan 16th, 2015

the answer correct is : Option D

Explanation:

91 is divisible by 7. So, it is not a prime number.


Jan 16th, 2015

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