Approach — Direct Calculation
3/4th do not know English or Hindi
So 1/4th know or Hindi or
1/6th know English and 1/8th know Hindi
Now,
Answer is 1/24
Note — We negative of double
counting1/24 i.e. students knowing both
Students knowing English includes the
students who know both languages.
Also, Students knowing Hindi too
includes the students who know both