Probability of an occurrence of an event is defined as

Number of trials in which the event happened divided by the total number of trials.

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The total number of trials divided by Number of trials in which the event happened

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Number of trials in which the event not happened divided by the total number of trials.

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The total number of trials multiplied by Number of trials in which the event happened

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Solution

The correct option is A
Number of trials in which the event happened divided by the total number of trials.

By definition, the probability of an occurrence of an event is defined as the number of trials in which the event happened divided by the total number of trials.

$Probability = \frac{Number of occurrence in which event happened}{Total number of trials}$

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