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# When you throw a coin, the probability of getting head is

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When you throw a coin, the probability of getting head is [#permalink]  26 Nov 2005, 06:34
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13. When you throw a coin, the probability of getting head is not 50%. When you throw a coin twice, what is the probability of getting heads only?

(1) The probability of getting head is twice that of getting tail.
(2) The probability of getting one head and one tail is 4/9.
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Last edited by gamjatang on 30 Nov 2005, 23:27, edited 1 time in total.
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P(getting head) + P(getting tail) = 1

Statement 1:
2x + x = 1
x = 1/3

P(getting tail) = 1/3

Probability of getting head twice = 2/3 x 2/3 = 4/9
Statement 1 is sufficient

Statement 2:
This seems incorrect because the sum of probability of getting head and tail should be 1 since there are only 2 outcomes to flipping a coin.
Statement 2 is not sufficient.

What is OA?
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