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29 July, 13:29

What is the sum of all integers that satisfy - 3n<7n-20<3n

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  1. 29 July, 13:39
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    First let's solve the inequality

    -3n<7n-20<3n

    0<10n-20<6n

    0<10n-6n<20

    0<4n<20

    0
    n ∈ ]0,5[

    the integers in this interval are 1,2,3,4. their sum is 10
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