Out of 450 students in a school 193 students read Science Today 200 students read Science Refresher while 80 students read neither How many students read both the magazines?

137

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Solution

The correct option is D 23
Clearly out of the 370 students who read magazines, 23 must read both as simply adding gives 393 students.

Proof by set theory

$A \cup B = A + B - A \cap B$

$A \cap B = 200 + 193 - 370 = 23$

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Out of 450 students in a school 193 students read Science Today 200 students read Science Refresher while 80 students read neither How many students read both the magazines?

The correct option is D 23Clearly out of the 370 students who read magazines, 23 must read both as simply adding gives 393 students.Proof by set theoryA∪B=A+B−A∩BA∩B=200+193−370=23

The correct option is D 23
Clearly out of the 370 students who read magazines, 23 must read both as simply adding gives 393 students.

Proof by set theory

$A \cup B = A + B - A \cap B$

$A \cap B = 200 + 193 - 370 = 23$