Question

A bag contains 3 red balls and 7 white balls. What is the probability of getting a red ball when one ball is taken out randomly without seeing

Answer 1

$given = red \: balls = 3 \\ white \: balls = 7 \\ total \: balls = 10 \\ p(red \: ball) = \frac{favourable \: case}{total \: cases} \\ p(red \: ball) = \frac{3}{10}$