Question 3 The code for Alice's bicycle lock consists of an 8-digit number sequence wil digits chosen from the set: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9), and repeated digits allowed. (a) How many possible codes are there? (b) How many codes start with the sequence 987? (c) How many codes end with the sequence 321?

Q: help

A: Please refer to the image below

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