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Find the sum (x+2)^(n-1)+(x+2)^(n-2)(x+1...

Find the sum `(x+2)^(n-1)+(x+2)^(n-2)(x+1)^+(x+2)^(n-3)(x+1)^2++(x+1)^(n-1)` `(x+2)^(n-2)-(x+1)^n` b. `(x+2)^(n-2)-(x+1)^(n-1)` c. `(x+2)^n-(x+1)^n` d. none of these

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