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(i) Probability is a chance of an occurrence. 
(ii) If an event cannot happen, probability is zero. If an event happens then the probability is one.(iii) The probability of an event A is a number P(A) such that 0 < P(A) ≤ 1.
(iv) Probability is usually expressed as fraction.
(v) Probabilty of a sure event and impossible event are 0 and 1 respectively.
(vi) Probability of an event = .
(vii) The sum of all the probabilities is one.

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