A  box contains 8 ten-peso coins and 5 five-peso coins. In how many ways can 3 coins be drawn in such that                 (a) they are all ten-peso coins?                 -                 (b) they are all five-peso coins?                 -                 (c) 1 is a ten-peso coin and 2 are five-peso coins?

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A: Here AS PER POLICY I HAVE CALCULATED FIRST MAIN QUESTION PLZ REPOST FOR REMAINING PARTS