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Consider number N = 8 7 a 2 7 9 3 1 b, w...

Consider number N = 8 7 a 2 7 9 3 1 b, where b is a digit at unit's place and a is a digit at ten lakh's place. The greatest value of b for which N is divisible by 8 is (A9 prime (B) composite (C) even (D) odd

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