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30 Dec 2021, 05:30
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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:
55%
(hard)
Question Stats:
58% (01:30) correct
42%
(01:22)
wrong
based on 231
sessions
History
Date
Time
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Not Attempted Yet
In order to pass a certain examination, a student has to obtain a minimum number of marks in each of five subjects. What is the total number of ways in which the student will not pass?
(A) 5
(B) 24
(C) 31
(D) 32
(E) 120
(A) 5
(B) 24
(C) 31
(D) 32
(E) 120
30 Dec 2021, 12:06
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It is 5!
As student can fail in all five to fail in one
Posted from my mobile device
As student can fail in all five to fail in one
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30 Dec 2021, 12:31
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Bunuel
Conditions he will not pass the examination:
I) He fails in one subject : He can fail in any of the 5 subjects so, 5C1 =5
II) He fails in two subjects: He can fail in any of the 5subjects so, 5C2 = 10
III) He fails in three subjects : He can fail in any of the 5subjects so, 5C3 = 10
IV) He fails in four subjects: He can fail in any of the 5subjects so, 5C4 = 5
V) He fails in all five subjects so, 5C5 = 1
Adding all we will get 31 ways. C
