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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: 52230
If a coin is tossed twice what is the probability that it will land ei  [#permalink]

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24 Jul 2016, 08:30
00:00

Difficulty:

15% (low)

Question Stats:

77% (00:35) correct 23% (00:34) wrong based on 152 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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Joined: 22 Jun 2016
Posts: 245
Re: If a coin is tossed twice what is the probability that it will land ei  [#permalink]

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24 Jul 2016, 08:42
1
1
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
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Schools: Boston U '20 (M)
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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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29 Jul 2016, 12:35
1
Intern
Joined: 15 Oct 2017
Posts: 30
Location: Ireland
Concentration: Healthcare, Finance
Re: If a coin is tossed twice what is the probability that it will land ei  [#permalink]

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21 Dec 2017, 03:58
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 &nbs [#permalink] 21 Dec 2017, 03:58
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