Question

A box contains $4$ red balls, $5$ green balls and $6$ white balls. A ball is drawn at random from the box. What is the probability that the ball drawn is either red or green?

Answer 1

Number of red balls$R=4$

Number of green balls$G=5$

Number of white balls $W=6$

Total Number of balls $T=R+G+W=4+5+6=15$

Probability of getting a red or green ball $=\frac{R+G}{T}=\frac{(5+4)}{15}=\frac{9}{15}=\frac{3}{5}$