If E1, E2, E3, ....., En are n elemantary outcomes associated to a random experiment, then P(E1) + P(E2) + P(E3) + ........... + P(En) = ______________.

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Solution

The correct option is B 1
The sum of probabilities of all outcomes in an experiment = 1.

For example, if we toss a coin there are two possibilities either heads or tails .

Probability of head is $\frac{1}{2}$ and probability of tail is $\frac{1}{2}$ .

Sum of all probabilities = $\frac{1}{2} + \frac{1}{2} = 1$ .

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