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1 July, 15:27

This one is hard, What number does it follow?

1,3,6,10,15,21,

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  1. 1 July, 18:17
    0
    Its a sum of all previous iteration.

    1=1

    3=1+2

    6=1+2+3

    10=1+2+3+4

    15=1+2+3+4+5

    ...

    etc
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