EM-2850

Complementary events

E Math · Secondary 4 · Hard · Complementary events

A box contains 3 green, 4 yellow and 5 purple marbles. Two marbles are drawn at random without replacement.

Find the probability that the two marbles are of different colours.

$\dfrac{47}{66}$
$\dfrac{19}{66}$
$\dfrac{23}{66}$
$\dfrac{7}{11}$

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