In a country x all markers are red or blue. in a box in country x there are 9 markers. i look at a random marker in the box and see that it is blue. what is the probability that in the box there are 1 red and 8 blue markers

Answer-

The probability that in the box there are 1 red and 8 blue markers is 0.111 or 11.1%

Solution-

In the box all markers are red or blue. There are total of 9 markers.

So the number of possible combination number of red or blue marker is,

As at the random drawn, there was a Blue marker, so the condition of (9,0) i.e 9 Red marker and 0 Blue marker is not a case.

So the sample space becomes,

Let us assume that E is the event that in the box there are 1 red and 8 blue markers. So

The probability that in the box there are 1 red and 8 blue markers is,

the answer is a

step-by-step explanation: