Question

5. The sum of probabilities of elementary events is always:
(a) 1
(b) 2. (c) 0
(d)-1​

Answer 1

Answer:

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The probability p of any event must be greater than or equal to 0.

In other words, 0≤p≤1.

Since 1 is the maximum limit, all probabilities must add to 1.

Hence, the sum of the probabilities of all the elementary events of an experiment is 1.