Question

You can randomly draw a marble from a bag of marbles than contains 8 blue marbles ,5 green marbles ,and 8 red marbles .What P(draw a blue or red marble)

Answer 1

P(draw a blue or red marble) =
`(16)/(21)`

Explanation:

The bag contains 8 blue, 5 green, and 8 red marbles

Total number of marbles is 8 + 5 + 8 = 21

P(draw a blue or red marble) = P(blue marble) or P(red marble)

In probability,"Or" means addition (+)

So, P(draw a blue or red marble) = P(blue marble) + P(red marble)

P(draw a blue or red marble) =
`(8)/(21)` +
`(8)/(21)` =
`(16)/(21)`

P(draw a blue or red marble) =
`(16)/(21)`