In a group of 400 players some are outdoor players, some are indoor players and some plays both. 350 plays outdoors and 110 plays indoor. How many plays indoor as well as outdoor games.
Choose the correct choice from the following choices:
A) 70
B) 60
C) 90
D) 100
E) 110

Rationale: consider total number of players n ( o u i ) = 400 players who plays outdoors n ( o ) = 350 players who plays indoors n ( i ) = 110 players who plays both n ( o â ˆ © i ) = ? n ( o u i ) = n ( o ) + n ( i ) - n ( o â ˆ © i ) 400 = 350 + 110 - n ( o â ˆ © i ) n ( o â ˆ © i ) = 460 - 400 n ( o â ˆ © i ) = 60 so people read both science fiction and literacy works are 60 answer : b
Answer: B