Question

A bag contains 12 blue balls and x red balls. If one ball is drawn at random what is the probability that it will be a red ball?

Answer 1

Sample space = 12 + x

n(S) = x + 12

Let A be the event of getting a red ball

n(A) = x

P(A) = `("n"("A"))/("n"("S"))`

= `(x/(x + 12))`