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

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Manager
Joined: 10 Oct 2005
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A coin that is tossed will land heads or tails, and each [#permalink]  30 Sep 2006, 12:37
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A coin that is tossed will land heads or tails, and each outcome has equal probability. What is the probability that the coin will hand 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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Manager
Joined: 25 May 2006
Posts: 227
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Getting A - 1/4

1st toss: P: 1/2 for heads
2nd toss: P: 1/2 for heads

So,

@ least one head in the two tosses:

(1/2)^2=1/4[/quote]
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Senior Manager
Joined: 11 Jul 2006
Posts: 383
Location: TX
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Kudos [?]: 6 [0], given: 0

3/4

Atleast once 1 in 2 tosses

Case 1

VP
Joined: 25 Jun 2006
Posts: 1173
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E. 3/4.

you can finger count, or use probability formula.
Manager
Joined: 12 Sep 2006
Posts: 92
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Kudos [?]: 2 [0], given: 0

got E as well

1-1/4=3/4
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