In a group of 25, 13 can speak Latin, 15 can speak French,
and 6 don’t speak either. How many of these speak both Latin
and French?

Answer Posted / akki_pikki

from formulae n(aUb)=n(a)+n(b)-n(aRUb),so
n(aUb)=25-6=19,n(a)=13,n(b)=15,n(aRUb)=x,so now,19=13+15-x
28-19=9,so answer is 9

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