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by Brian Gladman on May 16, 2015

Sunday Times Teaser 2747 – Marble Jar

by Michael Fletcher

A jar contains almost 400 marbles, some red and the rest blue. If four marbles are randomly removed, the chance that they are all red is exactly 1 in N where N is a four digit number.

How many red and how many blue marbles did the jar originally contain?

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