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28 Jun 2022, 07:00
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A
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:
79% (00:58) correct
21%
(01:15)
wrong
based on 56
sessions
History
Date
Time
Result
Not Attempted Yet
A basic model of a slot machine randomly shuffles and presents different combinations of the letter of the word MATH. What is the probability that the position of the "A" remains unchanged when the letters of the word MATH are re-arranged?
A. 1/4
B. 1/6
C. 1/3
D. 1/24
E. 1/12
A. 1/4
B. 1/6
C. 1/3
D. 1/24
E. 1/12
28 Jun 2022, 07:21
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Bunuel
A can have 4 places and then shuffling the rest of the letters would give 3! arrangements
Keeping A in the same place we would have 3! arrangements out of 4! arrangements in total
So probability = 3!/4! = 1/4
Option A
28 Jun 2022, 11:20
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Permutation where n = k so the order matters and there’s no repetition.
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