Answers

2014-07-27T20:56:32+05:30
398-7=391=17*23
436-11=425=17*25
542-15=527=17*31
hence the largest number is 17.

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2014-07-27T23:29:00+05:30
We can write 398-7=391 436-11=425 542-15=527 these all no. r divide by 17 leaving 7 11 15 reminder
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