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GMAT Quant — Probability & Combinations

In a bag with n marbles, m are blue and the remaining are red. If a marble is drawn at random, the probability of selecting a blue marble is \frac{m}{n} . What is the probability of selecting a marble that is not blue?

Explanation	Calculations	Help
$We apply Inverse Probability Rule to relate the probability of selecting a marble that is not blue to the probability of selecting a blue marble$	$P (not blue) = 1 - P (blue)$	Theory & Tactics Method Card PC1-E Click to view full details
$We substitute \frac{m}{n} for P (blue) to find the probability of selecting a marble that is not blue$	$P (not blue) = 1 - \frac{m}{n} = \frac{n - m}{n}$

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A

GMAT Quant — Probability & Combinations

In a bag with n marbles, m are blue and the remaining are red. If a marble is drawn at random, the probability of selecting a blue marble is \frac{m}{n} . What is the probability of selecting a marble that is not blue?

Explanation	Calculations	Help
$We apply Inverse Probability Rule to relate the probability of selecting a marble that is not blue to the probability of selecting a blue marble$	$P (not blue) = 1 - P (blue)$	Theory & Tactics Method Card PC1-E Click to view full details
$We substitute \frac{m}{n} for P (blue) to find the probability of selecting a marble that is not blue$	$P (not blue) = 1 - \frac{m}{n} = \frac{n - m}{n}$

Scroll horizontally to view all columns

A