SOLUTION: Serena has found 5 foreign-films and 4 local films she likes in a DVD shop, and she is going to buy 4 of them. According to each of the following conditions, find the number of com
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-> SOLUTION: Serena has found 5 foreign-films and 4 local films she likes in a DVD shop, and she is going to buy 4 of them. According to each of the following conditions, find the number of com
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Question 1190659: Serena has found 5 foreign-films and 4 local films she likes in a DVD shop, and she is going to buy 4 of them. According to each of the following conditions, find the number of combinations of the films bought. Answer by greenestamps(13198) (Show Source):
