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There are three math problems in the third grade of primary school!
I know the third question: with 1, 2, 3, you can form (6) three digits. ( 123、 132、2 13、23 1、3 12、32 1)

Question 4: 4568, 4586, 4658, 4685, 4856, 4865,

5468、5486、5648、5684、5846、5864、

6458、6485、6548、6584、6845、6854、

8456、8465、8546、8564、8645、8654。 A: Twenty-four.

I only know these two questions, sorry! Hope to adopt.