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
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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
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