gohan
I think a is correct answer because 1 is the only digit which can fit with other numbers and can multiply its own term with its so (a) is correct answer
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zerodown1024
Pair of twin primes differ by 2 , i.e. Option (b) Some example are - (17,19) , (3,5),(9,11) etc...
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Some example are - (17,19) , (3,5),(9,11) etc...