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

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Math Expert
Joined: 02 Sep 2009
Posts: 44342
If a coin is tossed twice what is the probability that it will land ei [#permalink]

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24 Jul 2016, 09:30
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Difficulty:

15% (low)

Question Stats:

78% (00:16) correct 22% (00:19) wrong based on 134 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
[Reveal] Spoiler: OA

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Joined: 22 Jun 2016
Posts: 250
Re: If a coin is tossed twice what is the probability that it will land ei [#permalink]

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24 Jul 2016, 09:42
1
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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

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Joined: 12 Aug 2015
Posts: 2499
GRE 1: 323 Q169 V154
Re: If a coin is tossed twice what is the probability that it will land ei [#permalink]

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29 Jul 2016, 13:35
1
KUDOS
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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Joined: 16 Oct 2017
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Re: If a coin is tossed twice what is the probability that it will land ei [#permalink]

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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
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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