Question

In a Mathematics class, 20 children forgot to bring their rulers, 17 children forgot to
bring their pencils and 5 children forgot to bring both ruler and pencil. Then find the
number of children
(i) who forgot to bring only pencil. (ii) who forgot to bring only ruler.
(iii) in the class.

Answer 1

Solution:-

given by:-


(children forgot to bring their rulers n(R)= 20

(children forgot to bring their pencils n(P) = 17

children forgot to bring both ruler and pencil= n(R∩P) = 5

》= n(RUP) = n(R)+n(P) -n(R∩P)

》= n(RUP) = 20+17-5

》= n(RUP) = 32

32 students in the class

acourding to question:-

(i ) 32 - 17 = 15

15 students forgot to bring only pencil.

(ii) 32 - 20 = 12

12 students forgot to bring only ruler.

(iii)

32 students in a mathematics class.



☆i hope its help☆