GATE 2012 Out of all the 2-digit integers between 1 and

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GATE 2012 
Out of all the 2-digit integers between 1 and 100, a 2-digit number has to be selected at random. What is the probability that the selected number is not divisible by 7?

(A) 13/90
(B) 12/90
(C) 78/90
(D) 77/90

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