What will be the probability to get his success in that exam ?

140 views

A student get 450 marks out of 500 marks in an exam having subject Hindi, Mathematics, Physics, Chemistry and English. For qualifying an exam of Science his score should be 90% in 3 subjects Physics, Chemistry and Mathematics.
What will be the probability to get his success in that exam ?

posted Apr 30, 2015

Number of combinations for Physics, Chemistry and Mathematics are
(5*4*3*2*1)/(3*2*1*2*1) = 10
Out of 10 combinations non-qualifying combination are
(82,85,93), (82,85,94), (82,85,96) and (82,93,94)
So possibility to get his success = 6/10
=3/5

Similar Puzzles

A student gets 450 marks out of 500 in an exam having subject Hindi, Mathematics, Physics, Chemistry and English. For qualifying an exam of science his score should be 90% in 3 subjects Physics, Chemistry and Mathematics.

What is the Probability to get his success in the exam?

A 3 digit number is such that 2 digits of the number are 1 and 2.
What is the probability that we would get success in our one trail to guess the number ?