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There are altogether 19 Chinese visitors and 9 English visitors in a tour. If 5 visitors are selected from the tour to form an activity group consisting of at least 1 Chinese visitor, how many different activity groups can be formed
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理解问题There are altogether 19 Chinese visitors and 9 English visitors in a tour. If 5 visitors are selected from the tour to form an activity group consisting of at least 1 Chinese visitor, how many different activity groups can be formed
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There are altogether 19 Chinese visitors and 9 English visitors in a tour. If 5 visitors are selected from the tour to form an activity group consisting of at least 1 Chinese visitor, how many different activity groups can be formed不在提醒