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2 Students have 6 dollar notes worth 500 dollars, and 4 notes worth 1000 dollars. Notes with the same value are not distinguished.

A-How many ways to split the notes

B-How many ways to split the notes, so that both get an equal amount of notes.

C-How many ways to split the notes, so that both get an equal amount of money.

D- How many ways to split the notes if we distinguish the notes among each other.

And another:

There is given a set M with m elements and set N with n elements and function f:M->N

A- How many diferent bijective functions exist when m=n?

B- How many diferent injective functions exist when m<=n?

C- how many diferent surjective functions exist when m>=n?

thx!