Solution:
we are given that
In a class, every student knows French or German (or both).
15 students know French, and 17 students know German.
Suppose there are x student who knows both French and German.
Then Total number of student in the class will be [tex] (15+17-x)=32-x [/tex]
But to guess the largest possible number of student in the class we can assume x=0
Hence the largest Possible number of Student in the class=32
