Forty students watched films A, B and C over a week. Each student watched either only one film or all three. Thirteen students watched film A, sixteen students watched film B and nineteen students watched film C. How many students watched all the three films?

0

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2

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4

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8

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Solution

The correct option is C $4$

$T o t a l s t u d e n t s = 40$

$13 - x + 16 - x + 19 - x + x = 40$

$S t u d e n t s w a t c h e d a l l t h r e e m o v i e s$
$x = 4$

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