self Maths Puzzle

Find the greatest number by which if we divide 740, 838 and 985, then in each case the remainder is the same.

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self Other Question

Let N = 23×317×56×74 and M = 212×35×54×78. P is total number of even factors of N such that they are not factors of M. Q is the total number of even factors of M such that they are not factors of N. Then 2P -Q = ? What is the remainder when 8100 is divisible by 17.