When 89 and 125 are divided by a, the remainders are 4 and 6 respectively

Let be a positive integer. When 89 and 125 are divided by a, the remainders are 4 and 6 respectively. Then the value of a is
(a) 9
(b) 7
(c) 15
(d) 17

Anurag Mishra Professor Asked on 21st March 2016 in Maths.
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    Answer: (d) 17 

    Anurag Mishra Professor Answered on 9th May 2016.
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