Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 4 | A Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Just need part 2
Probability = 18/35 x 15/37 = 270/1295
Case 2 : teacher picks a girl from Class A.
Probability = 17/35 x 14/37 = 238/1295
Required probability
= 270/1295 + 238/1295
= 508/1295
See 1 Answer