Question

in a class 40% of the students offered Physics 20% offered Chemistry and 5% offered both. If a student is selected at random, find the
probability that he has offered Physics or Chemistry only.​

Answer 1

Answer:

let a= student of physics =p(a)=40/100

let b= student of chemistry = p(b) = 20/100

probability that student of both subject is p(anb) = –5/100

thn required the probability is p(aub)=p(a)+p( b ) —p(anb)

40/100+20/100 —5/100=55/100

hope it will help you