summation of pmf of binomial distribution is equal to 1

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HANDWRITTEN NOTES ON :
►t distribution : https://tfzdistribution.blogspot.com/...
►f distribution : https://tfzdistribution.blogspot.com/...
►z distribution : https://tfzdistribution.blogspot.com/...
►binomial distribution : https://discretedistributions.blogspo...
►Poisson distribution :
https://discretedistributions.blogspo...
►negative binomial distribution :
https://discretedistributions.blogspo...
►Geometric and Hypergeometric distribution :
https://discretedistributions.blogspo...


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