Answer:
All prime numbers upto 100 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97. Out of these prime numbers, a pair of prime numbers having same digits are (i) 13, 31 (ii) 17, 71 (iii) 37, 73 (iv) 79, 97 Hence, there are 4 pairs of such types.
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