The number of two-digit prime numbers that remain prime when the digits are reversed is:

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answer is A.

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Detailed Solution

The two-digit prime numbers are
11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,87,97
Write the reversed digits.
11,31,71,91,32,92,13,73,14,34,74,35,95,16,76,17,37,97,38,78,79
Therefore, there are 9 two-digit numbers that remain prime when the digits are reversed.

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