Question

Probability of an event is $0.3$ then what is the probability that even will not occur?

Answer 1

Probability of an event happening $p=0.3$
Probability of the event not happening $=?$

We know that, "Probability of an event happening $+$ Probability of the event not happening$=1$"

$\therefore$ Probability of the event not happening $=1-$Probability of an event happening

$=1-0.3$

$=0.7$

$\therefore$ Probability of the event not happening is $0.7$