Question

the sum of probabilities of all elementary events of an experiment is ​

Answer 1

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Step-by-step explanation:

it is the sum of probability of all elementary events of an experiment

Answer 2

Answer: the sum of probabilities of all elementary events of an experiment is ​always equal to 1

Step-by-step explanation:

lets explain it with an example

   the probability of getting heads in the toss of a coin is 1/2 i.e 0.5 and the probability of a tails in the same, 1/2  which is 0.5

    so 0.5+0.5=1

 this can happen in any situation

hope this answer helps :-)