How many three-digit numbers are divisible by 7 or 5?
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The nearest number greater than 100 & divisible by 7 is 105, which is 7*15. Similarly, the nearest number less than 999 & divisible by 7 is 994 which is 7*142. So, if u substract 15 from 142, it will give you how many numbers are divisible by 7 in that range.
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