In an examination 35% of total students failed in Hindi , 45% failed English and 20% in both .Find the percentage of
those who passed in both the subjects .
Then A and B be the sets of students who failed in Hindi and English respectively
Then , n(A) = 35, n(B) = 45, n`(A nn B)` = 20
so, n`(A uu B)` = n(A) + n(B) - n`(A nn B)` = (35 + 45 - 20) = 60
`:.` percentage failed in Hindi or English or both = 60%
Hence ,percentage passed = (100 - 60)% = 40%.
Submit Comment/FeedBack