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Find the value of n .question is shown in attachment

Find the value of n .question is shown in attachment

Question Image
Grade:12th pass

1 Answers

Aditya Gupta
2075 Points
11 months ago
Use Lhopital rule (0/0 form)
so limit becomes
Lt x tends to 1 (1+2x+3x^2+......+nx^(n-1))/1
= 1+2+3+......+n= n(n+1)/2 = 820
or n(n+1)= 1640= 40(40+1)
or n= 40
KINDLY APPROVE :))

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