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25 August, 19:10

0, 1, 3, 6, 10, 15, 21, what is the next number

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  1. 25 August, 19:17
    0
    28

    Step-by-step explanation:

    because in this series the gap between number is gradually increasing from 1 and so this times its the turn of number 7 so 21 + 7 = 28
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