The coefficient of xr(0≤r≤(n–1)) in the expansion of (x+3)n− – InterviewSolution

1.	The coefficient of xr(0≤r≤(n–1)) in the expansion of (x+3)n−1+(x+3)n−2(x+2)+(x+3)n−3(x+2)2+⋯+(x+2)n−1.
Answer» The coefficient of $x^{r} (0 \leq r \leq (n - 1))$ in the expansion of $(x + 3)^{n - 1} + (x + 3)^{n - 2} (x + 2) + (x + 3)^{n - 3} (x + 2)^{2} + \dots + (x + 2)^{n - 1}$ .

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