Statistics - Probabilities
21. 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
- Option : B
- Explanation :
Let A be the event of getting 5 or 6
P(A) = 1/3 and B be the event of getting 1,2,3,4
P(B) = 2/3
In order to get a 'Head' before "5 or 6", the
following events have to occur:
H, TBH, TBTBH, TBTBTBH, ....
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