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battery88
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Homework Statement
A coin is biased so that the probability of heads is 2/3. What is the probability that exactly four heads come up when the coin is flipped seven times, assuming that the flips are independent?
Homework Equations
The Attempt at a Solution
C(7,4)(2/3)^4(1/3)^3 = (35*16)/3^7 = 560/2187
Now, I know this answer is correct, but what if we were asked to find probability of exactly one tail followed by three heads rather than exactly four heads: How would I calculate the answer for that?
Thank you.