?
A box contains 10 balls out of which 3 are red and rest are blue. In how many ways can a random sample of 6 balls be drawn from the bag so that at the most 2 red balls are included in the sample and no sample has all the 6 balls of the same colour?
Answer & Solution
Correct Answer:
Option
B
Six balls can be selected in the following ways:
One red ball and 5 blue ball
Or
Two red balls and 4 blue balls.
Total number of ways:
= (3C1 × 7C5) + (3C2 × 7C4)
= 63 + 105
= 168
= 63 + 105
= 168
Join the Discussion
Login to post a comment or share your explanation.
Login