Find the greatest number of five digits, which is exactly divisible by 7, 10,14, 15, 21 and 28.

99840

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99900

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99960

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99990

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Solution

The correct option is C
99960

The number should be exactly divisible by 14(7,2),15 (3, 5), 21 (3, 7), 28 (4, 7).
Hence, it is enough to check the divisibility for 3, 4, 5 and 7.
Only (c) is divisible by all.

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