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A coin that is tossed will land heads or tails, and each

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A coin that is tossed will land heads or tails, and each  [#permalink]

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New post 14 Nov 2008, 10:12
A coin that is tossed will land heads or tails, and each outcome has equal probability. What is the probability that the coin will land heads at least once on two tosses?

A. 1/4
B. 1/3
C. 1/2
D. 2/3
E. 3/4

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Re: coin---26  [#permalink]

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New post 14 Nov 2008, 12:20
E.

There are only four possible outcomes: T-T, T-H, H-T, H-H. Three of these four involve at least one head.
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Re: coin---26  [#permalink]

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New post 15 Nov 2008, 13:12
Another E 3/4

P of getting both T's is (1/2) ^ 2 = 1/4 Not getting both T's is same as atleast one H. 1-(1/4) = 3/4

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Re: coin---26 &nbs [#permalink] 15 Nov 2008, 13:12
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A coin that is tossed will land heads or tails, and each

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