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Probability of happening of an event is denoted by $p$ and probability of non-happening of the event is denoted by $q$. Relation between $p$ and $q$ is
- (a)$p+q=1$
- (b)$p =q-1$
- (c)$p = 1,q = 1$
- (d)$p+q+1= 0$
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(A) $p + q = 1$