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10 Mar 2025, 00:30
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C
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Difficulty:
55%
(hard)
Question Stats:
53% (01:01) correct
47%
(00:58)
wrong
based on 111
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If each student gets at least one pencil in the exam hall, what is the probability that a student gets exactly one pencil in the exam hall?
(1) 110 students are expected to get at least one pencil.
(2) 60 students are expected to get at least two pencils.
(1) 110 students are expected to get at least one pencil.
(2) 60 students are expected to get at least two pencils.
10 Mar 2025, 02:11
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Bunuel
Question: Probability of 1 pencil students = ?
Statement 1: 110 students are expected to get at least one pencil.
i.e. Total Students = 110 but the students with exactly 1 pencil is unknown hence
NOT SUFFICIENT
Statement 2: 60 students are expected to get at least two pencils.
i.e Students with 2 pencils or more = 60
But total students are unknown hence
NOT SUFFICIENT
COmbining the statements
We get,
Total = 110
Two or more pencils = 60
1 pencil Students = 110-60 = 50
SUFFICIENT
Answer: Option C
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10 Mar 2025, 02:33
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statement: each student gets at least one pencil in exam hall
Question is asking probability for student getting exactly 1 pencil.
here answer will be P= student getting exactly 1 pencil/ total no of student
Statement1: 110 students are expected to get at least one pencil.
this tells us no of students=110 as all the students are supposed to get at least one pencil as said in question
Statement 2:60 students are expected to get at least two pencils.
this gives us number of students getting 2 or more pencil but no information about total no of students hence not sufficient.
ST1+ST2: no of students getting exactly 1 pencil= students getting at least one pencil- students that get at least two pencils.
= 50
hence probability=50/110
=5/11
hence answer c
Question is asking probability for student getting exactly 1 pencil.
here answer will be P= student getting exactly 1 pencil/ total no of student
Statement1: 110 students are expected to get at least one pencil.
this tells us no of students=110 as all the students are supposed to get at least one pencil as said in question
Statement 2:60 students are expected to get at least two pencils.
this gives us number of students getting 2 or more pencil but no information about total no of students hence not sufficient.
ST1+ST2: no of students getting exactly 1 pencil= students getting at least one pencil- students that get at least two pencils.
= 50
hence probability=50/110
=5/11
hence answer c
