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

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Manager
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A coin that is tossed will land heads or tails, and each [#permalink] New post 30 Sep 2006, 12:37
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A
B
C
D
E

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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
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 [#permalink] New post 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
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 [#permalink] New post 30 Sep 2006, 14:18
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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 [#permalink] New post 02 Oct 2006, 00:13
E. 3/4.

you can finger count, or use probability formula.
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 [#permalink] New post 02 Oct 2006, 01:40
got E as well

at least one head

so 1 - P(no head)
1-1/4=3/4
  [#permalink] 02 Oct 2006, 01:40
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A coin that is tossed will land heads or tails, and each

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