Quantitative Aptitude - Probability
- Option : B
- Explanation : Two balls out 14 can be drawn in 14C2 ways which is the total number of outcomes.
Two white balls out of 8 can he drawn in 8C2 ways
Probability of drawing 2 white balls
Similarly 2 red balls out of 6 call be drawn in
6C2 ways
Probability of drawing 2 red balls
Probability of drawing 2 balls of the same
colour (either both white or both red)
22. The probability of drawing an ace or a spade or both from a deck of cards is
- Option : B
- Explanation : Probability of drawing an ace from a deck of
52 cards = 4/52
Similarly the probability of drawing a card of
spades = 13/52
Probability of drawing an ace of spades = 1/52
Since two events (i.e. a card being an ace and a
card being of spades) are not mutually exclusive.
therefore
Probability of drawing an ace or a spade
