Total number of marbles = 5 + 7 + 4 = 16
Number of non white marbles = 5+7 = 12
P(none of the 3 marbles drawn are white) = Number of ways to draw 3 non white marbles from 12 / Number of ways to draw 3 marbles from total 16
= 12C3 / 16C3
= 220/560
= 11/28
OR
P(none of the 3 marbles drawn are white) = P(first marbles is not white) x P(second marble from remaining 15 is also not white) x P(third marble from remaining 14 is non white)
= 12/16 x 11/15 x 10/14
= 11/28
Question: Consider a bag containing 5 green, 7 black and 4 white marbles. If three marbles...
Question: Consider a bag containing 5 green, 7 black and 4 white marbles. If three marbles are drawn randomly then what is the probability that none of them is white?
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