SOLUTION: A fair coin is thrown repeatedly. What is the probability that on the n th throw
A) a head appears for the first time
B) the number of tails and heads to date are equal
C) exac
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Question 779221: A fair coin is thrown repeatedly. What is the probability that on the n th throw
A) a head appears for the first time
B) the number of tails and heads to date are equal
C) exactly two heads have appeared altogether to date
D) at least two heads have appeared to date
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A fair coin is thrown repeatedly. What is the probability that on the n th throw
A) a head appears for the first time:: (1/2)^n
-----------------------
B) the number of tails and heads to date are equal::: (n/2)(1/2)^n
----------------------------------
C) exactly two heads have appeared altogether to date:: nC2(1/2)^n
-------------------------
D) at least two heads have appeared to date:: 1- nC(n-2)[(1/2)^n]
==================
Cheers,
Stan H.
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