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12 March, 07:01

The 100th pyramidal number is 338,350. that would make quite a stack of basketballs! What number must you add to get 338,350 to the 101st pyramidal number?

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  1. 12 March, 07:29
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    Lets look a pyramid numbers

    we have

    1st=1

    2nd=2

    3rd=6

    we notice that we jsut add the previous number on

    so 1st=1

    2nd=1+1

    3rd=1+2+3

    4th=1+2+3+4

    so therefor to get from 100th to 101th, just add 101
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