Consider the binomial expansion for 6 events: P6 + 6P5Q + 15P4Q2 + 20P3Q3 + 15P2Q4 + 6PQ5 + Q6 What term would you use in evaluating the probability of obtaining exactly 2 heads as the result of flipping an unbiased coin 6 times?
a. P6 c. 15P2Q4
b. 20P3Q3 d. the entire expression
C
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