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Q.

1+2x1!+3x22!+4x33!+=

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a

(x-1)ex

b

ex

c

(x+2)ex

d

(x+1)ex

answer is B.

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Detailed Solution

  1+2x1+3x22+4x33+ =1n xn-1n-1 =1(n-1) xn-1+xn-1n-1 =1xn-1n-2+=1xn-1n-1 =x ex+ex=(x+1) ex

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