PC1432

Pls download from the attachment. There may be typos here or there in the solution, pls correct by yourself.
 
I upload the solutions before class. My suggestion is that you download them after class. You'd better approach questions before looking at the solutions, otherwise you deprive yourself a chance to practice. But if you wish to have a look at the solution, and feel that will help your understanding in class, just go ahead. Wish this will help you.
 
Leiju
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