Question

05
& b.
The probability of selecting a blue marble at random fron
sa blue marble at random from a jar that contains only blue, black &
green marbles is 1/5 .the probability of selecting a black marble a
obability of selecting a black marble at random from the same jar is 74. if
the jar contains 11 green marbles, find the total no. of marbles in the jar.
A die is thrown once Find the nrohabilit
101​

Answer 1

Step-by-step explanation:

P (blue marble) = 1/5

P (black marble) = 1/4

∴ P (green marble) = 1 – (1/5 + 1/4)

P (green marble) = 11/20

Let total number of marbles be x.

Then.

11/20 × x = 11

⇒ x = 20