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avohden
Joined: 09 Jul 2013
Last visit: 14 Mar 2015
Posts: 403
Given Kudos: 630
Status:1,750 Q's attempted and counting
Affiliations: University of Florida
Location: United States (FL)
Schools: Warrington (A)
GMAT 1: 570 Q42 V28
GMAT 2: 610 Q44 V30
GMAT 3: 600 Q45 V29
GMAT 4: 590 Q35 V35
GPA: 3.45
WE:Accounting (Accounting)
17 Nov 2013, 18:39
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
75% (00:53) correct
25%
(00:57)
wrong
based on 252
sessions
History
Date
Time
Result
Not Attempted Yet
The probability is 1/2 that a certain coin will turn up heads on any given toss. If the coin is to be tossed four times, what is the probability that on at least one of the tosses the coin will turn up tails?
(A) 1/16
(B) 1/8
(C) 1/2
(D) 7/8
(E) 15/16
(A) 1/16
(B) 1/8
(C) 1/2
(D) 7/8
(E) 15/16
17 Nov 2013, 21:44
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avohden
It is easier to find the probability that on the 4 tosses, there will be no tails.
P(at least one tails) = 1 - P(No tails)
P(No tails) = P(All 4 Heads) = (1/2)*(1/2)*(1/2)*(1/2) = 1/16
P(at least one tails) = 1 - 1/16 = 15/16
17 Nov 2013, 23:44
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avohden
"Stolen" OG question:
Quote:
Discussed here: the-probability-is-1-2-that-a-certain-coin-will-turn-up-head-144730.html
