Question: a. 5. (Counting - 20 pt.) (6 pts.) Find the coefficient at x in the expansion of (3 + x)75 b. (8 pts.) Find the

a. 5. (Counting - 20 pt.) (6 pts.) Find the coefficient at x in the expansion of (3 + x)75 b. (8 pts.) Find the precise value of $4 C(51, i)(-2) c. (6 pts.) How many permutations of the letters ABCDEFGH: i. contain the string CDF? ii. contain the string FH and ACD? iii. contain the string AB and BAC? 1
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