# Does this Product = Binomial !!!!

Algebra Level 4

If $\left(4 - \frac{2}{1}\right) \cdot \left(4 - \frac{2}{2}\right) \cdot \left( 4 - \frac{2}{3}\right) \cdots \left( 4 - \frac{2}{k}\right) = {a \choose b}$ Then what is the value of $$a + b -3k$$

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