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How many numbers are divisible by 3 in the set of numbers 300,301,302,,499,500 ?

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Important Questions on Number System

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How many numbers are there between 200 and 800 which are divisible by both 5 and 7 ?
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In the above question total numbers in the set of numbers S={200,201,,800} which are either divisible by 5 or by 7 is :
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How many numbers are there in the set S={200,201,202,…,800} which are divisible by neither of 5 or 7 ?
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Total number of numbers lying in the range of 1331 and 3113 which are neither divisible by 2,3 or 5 is :
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Atleast what number must be subtracted from 434079  so that it becomes divisible by 137 ?
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In the above question, at least what number be added to 434079  , so that it will become divisible by (or multiple of) 137 ?
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Which one number is closest to 193 which is divisible by 18 is :
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The product of two numbers ab7 and cd5 could be, where ab7 and cd5 are individually three digit numbers.