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Bill and Ben takes turns flipping a coin. Whoever gets the head first is the winner.
If Bill has the first flip, what is the probability that he will win?
[Ref: ZHIP]
Direct Link: www.brainbashers.com?ZHIP
Hint: What is the probability of getting a head on the first toss?
Answer: 2/3.
The probability that he will get a head on his first toss is 1/2, if not, the probability he wins on his second toss is 1/2 + 1/8, etc. The sum of 1/2 + 1/8 + 1/32 + 1/128 = 2/3.
Puzzle 27
Which letters come next in this sequence:
NE US RN ER RS ==?==
[Ref: ZATA]
Direct Link: www.brainbashers.com?ZATA
Hint: Look to the skies.
Answer: TH.
The last two letters of the planets in reverse order from the sun.
Each term is a square expressed in base eight, 7 2=49 >> 61 in base 8.
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