WAEC - Mathematics (2007 - No. 38)

If the probability of an event occurring is x, what is the probability of the event not occurring?
1 - x
x - 1
0
\(\frac{1}{x}\)

Explanation

If p is the probability of an event happening(occurring) and the probability of an event not occurring is p1 then p + p1 = 1

p1 = 1 - p

x1 = 1 - x

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