Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$f(3)=\binom{4}{3}(\frac{1}{4})^{3}(\frac{3}{4})^{4-3}=$$

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