Question

a ball consists of 4 red balls 5 black and 6 White balls . one ball is drawn out of random . find the probability that the ball drawn is 1-black, 2- red or white

Answer 1

total black balls=5
total balls=15

p=black balls/total balls
=5/15
=1/3


total red+white balls= 4+6=10
total balls=15

p=total red and white balls/total balls

=10/15
=2/3

Answer 2

probability = 1/3
because there are total 3 colours of ball and e need to tell about 1 ball among three colours
therefore total no. of observation is 1 and total colours are 3