Question

How many two digit primes have both their digits non prime

Answer 1

Answer:

Thus, { 11 , 19 , 41 , 61 , 89 } is only the two digit number having both their non-prime.

Answer 2

Given :  two-digit primes having  both their digits non-prime

To find : all the numbers

Solution:

Two Digit Prime having both their Digit non prime

non prime Digits

1  ,  4  , 6  , 8  ,  9  

4 , 6 , 8 can not be 2nd Digit from prime numbers

11 ,  19

41      ( 49 is not prime)

61      (69 is not prime)

89     (81 is not prime)

11 , 19 , 41 , 61  & 89  are Two Digit Prime having both their Digit non prime

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