EM-2826

Combined events

E Math · Secondary 4 · Hard · Combined events

A bag contains 5 red balls and 7 blue balls. Two balls are drawn at random without replacement. What is the probability that the two balls are of different colours?

$\dfrac{5}{22}$
$\dfrac{7}{22}$
$\dfrac{35}{66}$
$\dfrac{31}{66}$

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