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29 Mar 2018, 23:54
Kudos
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C
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:
81% (01:29) correct
19%
(01:43)
wrong
based on 141
sessions
History
Date
Time
Result
Not Attempted Yet
Three of 12 remote controls in a box are defective. The remote controls are tested one at a time and not replaced in the box after testing. What is the probability that neither of the first two remote controls tested is defective?
(A) 1/6
(B) 2/9
(C) 6/11
(D) 9/16
(E) 3/4
(A) 1/6
(B) 2/9
(C) 6/11
(D) 9/16
(E) 3/4
29 Mar 2018, 23:59
Kudos
Bookmarks
Bunuel
3 defective
12 total
9 non defective
neither of first two defective = 9/12 x 8/11 = 6/11
30 Mar 2018, 00:38
Kudos
Bookmarks
3 defective
12 total
9 non defective
neither of first two defective = 9/12 x 9/12(since not replaced) = 9/16
12 total
9 non defective
neither of first two defective = 9/12 x 9/12(since not replaced) = 9/16
