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A, B and C pass the ball. After A passed the ball four times, the ball returned to A's hand. How many ways do you pass the ball?
.. this problem is solved by probability.

You can solve this problem by listing or drawing a tree diagram. .

The final answer should be six times.

.. pass instructions.

(A, B, A, B, A)

(A, B, A, C, A)

(A, B, C, B, A)

(A, C, A, B, A)

(A, C, A, A, A)

(A, C, B, C, A)

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