Out of the 2 digit integers between 1 and 100 a 2 digit number has to be selected at random. What is probability that the selected number is not divisible by 7?
A. 13/90
B. 12/90
C. 78/90
D. 77/90
Solution (By Examveda Team)
There are total 90 two digit numbers, out of them 13 are divisible by 7,these are 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98.
Therefore, probability that selected number is not divisible by 7 = 1 – 13/90 = 77/90.
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