Doubt in limits

ft1 paper1.10

@AshWin
@ThirdJuly
@Abhinav.08
@Sanjay_S
@mihir

pls help guys
ans is 43
thank you

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Evaluate this integral to get a=27. b=16
a+b=43
ab=432

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Use Incomplete Stirling approximation
ln(n!)=nln(n) - n

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