Answer:

Step-by-step explanation:
Given

Required
Factorize

Expand each term

Factor 6 out of the expression

Hence:

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Answer:
a) it is not a binomial, it is hypergeometric distribution.
Step-by-step explanation:
a) Four hundred different voters in a region with two major political parties, A and B, are randomly selected from the population of 3000 registered voters.
it is not a binomial because the probability of succes changes between one trial and another one, so the trials are not independent.
10 and 15 dear^^ 5(15) + 3(15) =28