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16 November, 06:35

Find positive integer x, if 1+2+3 + ... + x=120.

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  1. 16 November, 08:10
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    x = 15

    Step-by-step explanation:

    1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 = 120

    The number x is a positive integer.
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