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If x=(5)/((2!).3)+(5.7)/((3!).3^(2))+(5....

If `x=(5)/((2!).3)+(5.7)/((3!).3^(2))+(5.7.9)/((4!).3^(3))+….`
then find the value of `x^(2)+4x.`

A

17

B

23

C

27

D

39

Text Solution

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The correct Answer is:
B
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