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It's not specified what [itex]a[/itex] and [itex]b[/itex] is supposed to represent. That's where I need some explanation.The formula for the general term is

[tex]

T_n+1=C_n^r a^{n-r} b^r

[/tex]

Verify this formula by examples. This is the formula for the [itex](r+1)[/itex]-th term.

What would the formula for the [itex]r[/itex]-th term be?

I already made a nice Pascal triangle all the way to the 10th row.

All help is appreciated.