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If alpha=5/(2!xx3)+(5xx7)/(3!xx3^(2))+(5...

If `alpha=5/(2!xx3)+(5xx7)/(3!xx3^(2))+(5xx7xx9)/(4!xx3^(3))+...," then "alpha^(2)+4alpha=`

A

21

B

23

C

25

D

27

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The correct Answer is:
B
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