EM-2859

Combined events

E Math · Secondary 4 · Hard · Combined events

A bag contains 5 red counters and 7 blue counters. Two counters are drawn at random one after another without replacement.

Find the probability that the two counters drawn are of different colours.

Answer:

$\dfrac{35}{66}$
$\dfrac{7}{22}$
$\dfrac{5}{12}$
$\dfrac{7}{11}$

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