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15 August, 08:51

How many 3 digit positive integers are odd and do not contain the digit 5?

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  1. 15 August, 09:16
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    Hello,

    Assume n=a*100+b*10+c un integer positive odd with no 5.

    a∈{1,2,3,4,6,7,8,9},#8

    b∈{0,1,2,3,4,6,7,8,9},#9

    c∈{1,3,7,9},#4

    Number of integers searched: 8*9*4=288
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