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10 June, 19:36

How many 2-digit numbers are multiples of neither 5 nor 7?

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  1. 10 June, 19:51
    0
    11, 12, 13, 16, 17, 18, 19, 22, 23, 24, 26, 27, 29, 31, 32, 33, 34, 36, 37, 38, 39, 41, 43, 44, 46, 47, 49, 51, 52, 53, 54, 56, 57, 58, 59, 61, 63, 64, 66, 67, 68, 71, 72, 73, 74, 76, 78, 79, 81, 82, 83, 86, 87, 88, 89, 92, 93, 94, 96, 97, 99.

    62 in all

    1.353355e+102 if all multiplied together

    3326 if added together

    your welcome. This took like 30 minutes to finish!
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