Explain how you know if an event is unlikely to occur

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whenever the probability is zero, an event is unlikely to occur. probability = number of times an event can occur/ total number of outcomes for example , when there are 5 red and 2 blue balls in a sack and if a ball is randomly pulled out, the probability for red balls :  5/7  probability for blue balls : 2/7 probability for white balls : 0/7 = 0 hence, the event of picking up a white ball is unlikely to occur.

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