find the greatest number of 7 digits which is exactly divisible of 12 15 and 21
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Answer. i.e. 420. Now, since we want a 7 digit number, so, we must Multiply 420 with some number such that it becomes 7 digit.. To find by which number to Multiply, Divide 420 by largest 7 digit number, i.e. 9999999
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