# Expansion?

Find the coefficient of $$t^{24}$$ in the expansion of $$(1+t^{2})^{12}(1+t^{12})(1+t^{24})$$.

 

Notation: $$\dbinom MN$$ denotes the binomial coefficient, $$\dbinom MN = \dfrac{M!}{N!(M-N)!}$$.

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