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Math Help - Find the number of integers

  1. #1
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    Find the number of integers

    Find the number of integers from 1 to 10,000 which are divisible by either 13 or 51
    regards
    Sridhar
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  2. #2
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    Hello yshridhar

    Welcome to Math Help Forum!
    Quote Originally Posted by yshridhar View Post
    Find the number of integers from 1 to 10,000 which are divisible by either 13 or 51
    regards
    Sridhar
    10,000\div13 = 769.1, so there are 769 integers from 1 to 10,000 that are divisible by 13.

    In the same way, you can find the number of integers that are divisible by 51.

    Add this number to 769. Then you will need to subtract the number of integers that are divisible by 13\times51\; (= 663), because they will have been counted twice. (Note that 51 = 3 \times 17, so 51 and 13 have no common factors.)

    Can you complete this now?

    Grandad
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  3. #3
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    Thank you Grandad
    regards
    Sridhar
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