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If a math problem is one of 1, there are 2 and 3 on the left and 4 on the right. One fifth. 6. How many times can Aunt Kobayashi try to open the treasure chest?
You can draw a tree diagram.
Suppose the left is 1, and the right may be 4.5.6. There are three kinds.
Suppose the left is 2 and the right is 4.5.6. There are three kinds.
Suppose the left is 3 and the right is 4.5.6. There are three kinds.