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Prime Factors

The number of...

Question

The number of two digit prime numbers, with distinct digits, on being reversed they give again to prime number is:-

A

3

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B

5

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C

8

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D

11

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Solution

The correct option is C $8$
It doesn't require any theory , just count them
$13, 17, 31, 37, 71, 73, 79, 97$
So the answer is $8$

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