Discussion

How many two-digit prime numbers are there which have 2 as a unit digit?

Answer: A

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Any number with a unit digit of 2 (except for the number 2 itself) is an even number greater than 2.

All even numbers greater than 2 are divisible by 2, and therefore cannot be prime numbers.

Since we are looking for two-digit numbers (like 12, 22, 32,...), all of them will be even and greater than 2. Thus, none of them can be prime.

The number of such primes is 0.

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