In a mathematics class, 20 children had forgotten their rulers and 17 forgotten their pencils, "Go and borrow them from someone at once”, said the teacher, 24 children left the room, then how many children had forgotten both is

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Solution

The correct option is C
13

$N (R)$ = 20, n(P) = 17

$n (R \cup P)$ = 24

$n (R \cap P)$ = 20 + 17 - 24 = 13

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In a mathematics class, 20 children had forgotten their rulers and 17 forgotten their pencils, "Go and borrow them from someone at once”, said the teacher, 24 children left the room, then how many children had forgotten both is

The correct option is C 13 N(R) = 20, n(P) = 17 n(R∪P) = 24 n(R∩P) = 20 + 17 - 24 = 13

The correct option is C
13

$N (R)$ = 20, n(P) = 17

$n (R \cup P)$ = 24

$n (R \cap P)$ = 20 + 17 - 24 = 13