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171. The total number of ways of selecting six coins out of 20 one rupee coins, 10 fifty paise coins and 7 twenty five paise coins is
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https://www.meritnation.com/ask-answer/question/in-how-many-ways-can-6-coins-be-chosen-from-20-one-rupee-coi/permutations-and-combinations/3890832
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