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# If a 20-sided die, numbered with consecutive integers from 1 - 20, is

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Math Expert
Joined: 02 Sep 2009
Posts: 52254
If a 20-sided die, numbered with consecutive integers from 1 - 20, is  [#permalink]

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29 Mar 2017, 03:49
1
1
00:00

Difficulty:

15% (low)

Question Stats:

88% (01:11) correct 13% (00:49) wrong based on 47 sessions

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If a 20-sided die, numbered with consecutive integers from 1 - 20, is rolled twice, what is the probability of getting a number greater than ten on each roll?

A. 4/25
B. 14/95
C. 1/4
D. 81/400
E. 81/95

_________________
Senior Manager
Joined: 24 Apr 2016
Posts: 331
Re: If a 20-sided die, numbered with consecutive integers from 1 - 20, is  [#permalink]

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29 Mar 2017, 09:50
Total number of possibilities when rollng a 20-sided die twice = 20 * 20 = 400

Total number of ways of getting a number greater than ten on each roll = 10*10 = 100

probability of getting a number greater than ten on each roll = 100/400 = 1/4

Director
Joined: 21 Mar 2016
Posts: 523
Re: If a 20-sided die, numbered with consecutive integers from 1 - 20, is  [#permalink]

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29 Mar 2017, 22:41
total number of possibilities = 20 * 20 = 400

favourable outvomes = (11,12,13...20) =total 10 outcomes

since the dice is rolled twice so 10 * 10 = 100

prob = 100/400 = 1/4

ans C
Re: If a 20-sided die, numbered with consecutive integers from 1 - 20, is &nbs [#permalink] 29 Mar 2017, 22:41
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