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Thanks for your replay, I found the answer, I will do it next time if I have a question to ask.

They are both working for me.

5446-5447 are probability courses, and 4321-4322 are statistics. Usually, the statistical course starts from the BASIC cocepts of the probability. So, it really depends on what you need and what you want. BTW, 4321-4322 should be much easier than 5446-5447.

Guys, thank for his performance, 5 bottles already!