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Q. 1. Define Probability.
Ans. The probability of a given event is an
expression of likelihood of occurence of an event.
A probability is a number which ranges from 0 (zero)
to 1 (one) - zero for an event which cannot occur
and 1 for an event which is certain to occur.
Q. 2. Two coins are tossed. Find the probability
of getting:
- One head and one tail
- Exactly two heads
Solution. When two coins are tossed, the total
number of possible pairs is:
(H, H), (H, T), (T, T), (T, H)
So, n = 4
1) Favourable number of cases = 2
Therefore, required probability = 2/4 = 1/2
2) Favourable number of cases = 1
Therefore, required probability = 1/4
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