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How do I use a calculator to solve P=20c3/56c3? The actual question is. A radio station runs a promotion at an

auto show with a money box with 10 ​$25, 15 $tickets and 11 ​$1 tickets. The box contains an additional 20 ​"dummy" tickets with no value. Three tickets are randomly drawn. Find the probability that all three tickets have no value.

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