There are 15 coloured beads in a bag; seven beads are red, three are blue and five

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There are 15 coloured beads in a bag; seven beads are red, three are blue and five are green. Three beads are selected at random from the bag and not replaced. Find the probability that a the first and second beads chosen are red and the third bead is blue or green, b one red, one blue and one green bead are chosen.

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