কোনটি মৌলিক সংখ্যা?

A ৪৯

B ৫১

C ৫৭

D ৫৯

Solution

Correct Answer: Option D

47 is divisible by 7, so it is not prime

51 is divisible by 13, so it is not prime

57 is divisible by 3 and 19, so it is not prime. 

 

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