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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]

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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
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30 Sep 2006, 13:02
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
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30 Sep 2006, 14:18
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3/4

Atleast once 1 in 2 tosses

Case 1

Heads and tails 1/2*1/2
Tails and heads 1/2*1/2
Heads and Heads 1/2*1/2

Answer 1/4+1/4+1/4=3/4

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VP
Joined: 25 Jun 2006
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02 Oct 2006, 00:13
E. 3/4.

you can finger count, or use probability formula.

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Manager
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02 Oct 2006, 01:40
got E as well

at least one head

so 1 - P(no head)
1-1/4=3/4

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

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26 Oct 2016, 02:58
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: A coin that is tossed will land heads or tails, and each   [#permalink] 26 Oct 2016, 02:58
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# A coin that is tossed will land heads or tails, and each

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