Canadian Forces Aptitude Test (CFAT) Practice

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If the probability of an event happening is 7/8, what is the probability that it would not happen?

  1. 7/8

  2. 1/4

  3. 1/8

  4. 3/8

The correct answer is: 1/8

When considering the probability of an event not occurring, it is essential to understand the relationship between the probability of the event happening and the probability of it not happening. If the probability of an event occurring is denoted as P(Event), the probability of it not occurring can be found using the formula: P(Not Event) = 1 - P(Event) In this case, the probability of the event happening is given as 7/8. To find the probability of it not happening, you would apply the formula: P(Not Event) = 1 - (7/8) = 1/8 Thus, the probability that the event would not happen is 1/8. This aligns with the correct answer, confirming that the complementary probability accurately reflects the likelihood of the event not occurring.

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