Question

A bag contains 4 white balls and some red balls. If the probability of drawing a white ball from the bag is 2/5 , find the number of red balls in the bag.

Answer 1

Answer:

it is given that there are 4 red balls

let it be event a

p (a) =2/5 but n(a)=4

2/5=4/total balls

5×4=2×total balls

10=total ballst

red balls =total balls - white balls

red balls=10-4=6