A prime number contains the digit X at unit’s place. How many such digits of X are possible?

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For prime no units place cannot be occupied by even number except for 2 Thus no of digits occupying unit digit of prime numbers = 6 (1,2,3,5,7,9) Example 2,3,5,7,11,19 in itself are prime numbers

A prime number contains the digit X at unit’s place. How many such digits of X are possible?

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