Out of 450 students of a school, 325 play football, 175 play cricket and 50 ,neither play football nor cricket. How many
students play both football and cricket ?
n(A) = 325, n(B) = 175, n`(A uu B)` = 450 - 50 = 400
Required number = n`(A nn B)` = n(A) + n(B) - n`(A uu B)`= 325 + 175 - 400 = 100.
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