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A bag contains 10 coloured beads. Two are red, two are blue, two are yellow, two are green and two are white. A student takes
A bag contains 10 coloured beads.
Two are red, two are blue, two are yellow, two are green and two are white.
A student takes two beads out of the bag at random.
What is the probability that the two beads he takes are the same colour?
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