Question

!) A bag contains 2 yellow marbles, 9 purple
marbles, 18 green marbles, 10 blue marbles
and 7 red marbles. What is the probability of
pulling out a blue or a red marble?​

Answer 1

Answer:

Total number of marbles=2+9+18+10+7=46

The probability of pulling out a red marble in the 1st case= 2/46=1/23

Now that one marble has been pulled out, total number of marbles=45

Then probability of pulling out a purple marble in the 2nd case= 10/45=2/9

So the probability of pulling out a red marble in the first case and not replacing it and pulling out a purple marble in the 2nd case= 1/23 * 2/9

Answer 2

probability = (total no. of red + Blue marble) / (total no. of marbels)

so, probability = (10+7)/46

= 17/46