Can someone explain to me how the formula P(X=r) = nCr p^r q^(n-r) (Binomial Distribution) 969 viewsJanuary 3, 2024 Question100.55K July 27, 2021 0 Comments Can someone explain to me why combination is used here? I don’t quite understand how this work. In: Mathematics 2 Answers ActiveNewestOldest Anonymous Posted July 27, 2021 0 Comments Let r = 2 and n = 4. There are six ways in which two out of the four trials can be successful: First and second First and third First and fourth Second and third Second and fourth Third and fourth Hence, 4!/(2!2!) = 6. Make sense? You are viewing 1 out of 2 answers, click here to view all answers. Register or Login
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