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

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

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New post 29 Mar 2017, 04:49
1
1
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

83% (00:46) correct 17% (00:32) wrong based on 44 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
Spoiler: OA

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Re: If a 20-sided die, numbered with consecutive integers from 1 - 20, is [#permalink]

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New post 29 Mar 2017, 10:50
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

Answer is C. 1/4
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Re: If a 20-sided die, numbered with consecutive integers from 1 - 20, is [#permalink]

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New post 29 Mar 2017, 23:41
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   [#permalink] 29 Mar 2017, 23:41
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