Question

In an examination 120 students appeared. If 85 students passed in Math, 92 passed in English and 12 failed in both, then the number of students who passed in both equals

Answer 1

Answer:

Decide on how many books will be placed on each shelf. That is equivalent to writing on piece of paper 10 nonnegative (zeros are here allowed in c they are not!) integers x1,x2,…,x10x1,x2,…,x10 so that they add up to 25. For i=1,2,…,10i=1,2,…,10, xixi represents the number of books that will be placed on the ii-th shelf. The total number of ways that you can conduct this step is equal to the number of solutions to the 

Answer 2

Answer:

Total number of students=100

Number of students fail in English=(50-12)=38

Number of students fail in Maths=(30-12)=18

Number of students fail in both=12