Question

In the survey of 25 students it has been found that 15 take mathematics and 12 has taken physics 11 has taken chemistry 5 has taken chemistry and mathematics and chemistry 9 has taken mathematics and physics ,4has taken physics and chemistry and 3vhas taken all subject.Find the number of students who had taken mathematics and chemistry but nit physics?​

Answer 1

Step-by-step explanation:

R.E.F image

(i) 11−5−4+3=5

(3 removed twice)

(ii) 4−3=1

(iii) only maths =15−9−5+3

=4

only phy =12−9−4+3=2

only chem =5⇒Total=11

(iv) Atleast one =11+9+5+4−2(3)

=29−6=23

⇒ None =25−23=2

(v) 23