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>> No.11527358 [View]
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11527358

Hey, brainlet here!
I don't know how to prove equality of these two sums.
One is from binomial distribution and the other one is from negative binomial distribution.
And I'm sure they do equal. The thing is I can not change the indexes/do algebraic manipulations/use magic/... to prove it.
I would appreciate any help.

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