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Superbowl

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Superbowl [#permalink] New post 06 Feb 2011, 05:56
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

69% (01:28) correct 30% (01:10) wrong based on 13 sessions
A Superbowl sponsor X has a 30 sec commerical that is part of the 15 different commercials the network will show in the first commercial break .

What is the probability that Company X'’s advertisement will be one of the first two be shown during the fi…rst commercial break?

(A) 1/ 225
(B) 1 / 30
(C) 1 /15
(D) 2 / 15
(E) 4 /15
[Reveal] Spoiler: OA

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Re: Superbowl [#permalink] New post 06 Feb 2011, 06:14
Sponsor X's ad is 1 among 15 ads to be shown in the first break.

For X's ad to be shown as one of the first two ads:

It can be shown as the first ad
or
Doesn't get shown as the first ad AND gets shown as the second ad

P= \frac{1}{15}+\frac{14}{15}*\frac{1}{14}
P= \frac{1}{15}+\frac{1}{15}
P= \frac{2}{15}

"The information that it is a 30 sec ad is superfluous."

Ans: "D"
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Re: Superbowl [#permalink] New post 06 Feb 2011, 10:25
1/15 + (14/15) * 1/14 = 2/15 D
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Re: Superbowl [#permalink] New post 07 Feb 2011, 20:17
Expert's post
rxs0005 wrote:
A Superbowl sponsor X has a 30 sec commerical that is part of the 15 different commercials the network will show in the first commercial break .

What is the probability that Company X'’s advertisement will be one of the first two be shown during the fi…rst commercial break?

(A) 1/ 225
(B) 1 / 30
(C) 1 /15
(D) 2 / 15
(E) 4 /15


Or you can simply view it as 2 favorable spots (1st or 2nd) out of 15 available ones so probability = 2/15
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Re: Superbowl   [#permalink] 07 Feb 2011, 20:17
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