Giải thích: thể are 10white flowers,10 yellow flowers and 10 red flowers. People choose 4 flowers from the above flowers The probability of the event "The 4 flowers slected have all 3 colors" is:

Ai giỏi toán tiếng anh giúp tôi bài này tôi sắp thi nhưng chưa hiểu:thể are 10 white flowers,10 yellow flowers and 10 red flowers. People choose 4 flowers from the above flowers The probability of the event "The 4 flowers slected have all 3 colors" is: