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.