Question

The number 13 and 31 are prime numbers. Both these numbers have same digit 1 and 3. Find such pair of prime numbers up to 100​

Answer 1

SOLUTION:

prime numbers up to 100 having same digits are:

(i) 13,31 (ii) 17,71 (iii) 37, 73 (vi) 79,97

hence, there are 4 pairs of such type.