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in the expansion of (ax + by)^n, the coeffiients of the first 3 are 6561, 34992, and 81648., Find the value if a, b, and n.

i did this...

t1 = nC0 (ax)^n = 6561x^n

a^n = 6561

t2 = nC1 (ax)^n-1 (by)^1 = 34992x^n-1y

bna^n = 34992

but i'm not sure what to do next... and the rest