In a room of 36 people, 20 players play chase while 28 players play poker. How many players play both?
সমাধান
সঠিক উত্তর: Option C
আমরা জানি,
মোট = n(A) + n(B) - both + none
⇒ 36 = 20 + 28 - both + 0
⇒ 36 = 48 - both
⇒ both = 48 - 36
⇒ both = 12
