9 Write all 2-digit prime numbers, in which both the digits are also prime number
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As far as prime numbers are concerned the possibilities are 23, 37,53 and 73 so there are 4, two digit prime numbers where both digits are prime. Prime Numbers like 11, 13 are eliminated since 1 is not prime and so are prime numbers like 43,47 since 4 is not prime and so on.
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thus there are 9 such nummbers……. Besides the above , PRIME 11 is a palindrome Number. 11, 13, 17, 31, 37, 71, 73, 79, 97 are the two digit numbers which remain prime even on interchanging the digits.
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