Real Numbers

Question

A bag contains 3 red balls and 5 black balls. A ball is drawn at randome from the bag. What is the probability that the ball drawn is red? Sol. No. of red balls = 3 No. of black balls = 5 Total no. of balls = 3 + 5 = 8 i.e. n(s) = 8

Solution

Let A be the favourable outcomes of getting a red ball, then n (A) = 3 Therefore,

straight P left parenthesis straight A right parenthesis space equals fraction numerator straight n left parenthesis straight A right parenthesis over denominator straight n left parenthesis straight S right parenthesis end fraction equals 3 over 8