# Given the probability p = 0.7

Given the probability $p=0.7$ that an event will happen, how do you find the probability that the event will not happen?
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Step 1
Probability of an event happening $p=0.7$
Probability of the event not happening $=?$
$\text{Probability of an event happening}+\text{Probability of the event not happening}=1$
Step 2
Probability of the event not happening $=1-$ Probability of an event happening $=1-0.7=0.3$