Question

If the probability of an event is 2/7, what must be the probability of its complement?

Answer 1

It's 5/7 I got it right.

Explanation:

Hope this helps.

Answer 2

The answer is
`(5)/(7)`

Explanation:

In order to determine the probability, we have to know about complement.

The probability of the complement of any event is the difference between one and the probability of the event.

Pe=probability of the event

Pc=probability of the complement of the event

`Pe+Pc=1\\Pc=1-Pe`

We know the probability of the event, so we replace that value in the expression:

Then:

`Pe=(2)/(7)\\\\Pc=1-(2)/(7)\\Pc=(5)/(7)`

Finally, the probability of its complement is
`(5)/(7)`