ProbabilityHard
Question
In an examination of 100 students 70 students failed in maths, 75 in Physics, 80 in Chemistry and 85 in English. If a student is selected randomly what is the least value of probability that he is failed in all 4 subject-
Options
A.
B.
C.
D.
Solution
30 students passed in Maths
25 students passed in Physics
20 students passed in Chemistry
15 students passed in English
So maximum Number of students who passes in atleast one subject are 90
∴ minimum 10 students will be fail in all 4 subject
∴ probability is
.
25 students passed in Physics
20 students passed in Chemistry
15 students passed in English
So maximum Number of students who passes in atleast one subject are 90
∴ minimum 10 students will be fail in all 4 subject
∴ probability is
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