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Probability of Mathematics (Literature) in Senior Three
According to your topic, grading seems to have nothing to do with the question. ...

Generally speaking, the topic will not be useless, and there is nothing wrong with the topic. ....

Is the second question about the allocation table?

Let me see.

1, take a multiple of 3 twice, and the possibility is 2/6*2/6= 1/9.

2. Twice is not a multiple of 3, where 1, 4 divided by 3 is 1, and 2,5 divided by 3 is 2, so it can only be counted as (1, 2)( 1, 5) (2,4) (4,5) before and after the exchange.

Finally, 1/3. .....