The probability he first pulls a red tile is 3/10 because there are 10 possibilities and 3 where he pulls the red tile. After that, there are 9 tiles (because no replacement), 4 of which are blue. This is a chance of 4/9 for a blue tile immediately after. If two events are needed to occur, their chance of occurring is their product. (3/10)*(4/9) = (12/90) = 6/45 = 2/15 (B).
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