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If a coin is tossed twice what is the probability that it will land ei

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Bunuel
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If a coin is tossed twice what is the probability that it will land ei [#permalink] If a coin is tossed twice what is the probability that it will land ei   24 Jul 2016, 09:30
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A
B
C
D
E

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79% (00:37) correct 21% (00:34) wrong based on 217 sessions
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If a coin is tossed twice what is the probability that it will land either heads both times or tails both times?

A. 1/8
B. 1/6
C. 1/4
D. 1/2
E. 1
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D
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Re: If a coin is tossed twice what is the probability that it will land ei [#permalink] If a coin is tossed twice what is the probability that it will land ei   24 Jul 2016, 09:42
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Prob to get 2 heads = 1/2*1/2 = 1/4
Prob to get 2 tails = 1/2*1/2 = 1/4

So, Prob to get either 2 heads or 2 tails = 1/4+1/4 = 1/2

Answer will be D.
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stonecold
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Re: If a coin is tossed twice what is the probability that it will land ei [#permalink] If a coin is tossed twice what is the probability that it will land ei   29 Jul 2016, 13:35
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Again Possible cases => [h,h] [h,h] [t,t] [t,h]
Favourable outcomes = 2
possible outcomes = 4
P(E) = 2/4=1/2
Smash D
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Re: If a coin is tossed twice what is the probability that it will land ei [#permalink] If a coin is tossed twice what is the probability that it will land ei   21 Dec 2017, 04:58
Bunuel wrote:
If a coin is tossed twice what is the probability that it will land either heads both times or tails both times?

A. 1/8
B. 1/6
C. 1/4
D. 1/2
E. 1


The first probability to get anything after toss is 1
The second probability to get the same side of the coin is \(\frac{1}{2}\)

\(1 * \frac{1}{2} = \frac{1}{2}\)

D
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Re: If a coin is tossed twice what is the probability that it will land ei [#permalink]
21 Dec 2017, 04:58
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Bunuel
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