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The greatest number of - digits exactly divisible by is

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9999

9660

9832

9860

answer is B.

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Detailed Solution

Concept-
To solve such a problem, consider the maximum number of digits given, find the number to subtract from the maximum number, and make it an integer product of the least common multiple of the number.
The maximum 4-digit number is

Prime factors of

LCM of

and

LCM of

and

9999 must be divided by 420

and

Hence, the correct answer is option 2) 9660

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