Prove the identity for the negative binomial distribution given in Theorem 3.6.8, part (b).

Question:

Prove the identity for the negative binomial given in Theorem 3.6.8, part (b).
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...