Answers

2015-09-07T20:23:36+05:30
31's factors= 131 (31 is a prime number)
310's factors=1, 2, 5, 10, 31, 62, 155, 310
3100's factors=1, 2, 4, 5, 10, 20, 25, 31, 50, 62, 100, 124, 155, 310, 620, 775, 1550, 3100,
Common Factors of 31,310 and 3100 are 1 and 31.
31>1
∴hcf(31,310,3100)=31

ans=31

[or a simple way: since each number when divided by ten gives the previous number, it can only be 1 and the first number.

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