1.

The probability of selecting a blue marble at random from a jar thatcontains only blue, black and green marbles is . The probability ofselecting a black marble at random from the same jar is . If the jarcontains 11 green marbles, find the total number of marbles in the jar.4

Answer»

it will be 20as five blue11 green and 4 blackbecause probability is givenmeans 1out of totalso 1 out of 4 black1 out of 5 blueAnswer = 20



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