λ = ∫ 0 1 1 + x 3 d x
℘ = n → ∞ lim ( r = 1 ∏ r = n n 2 n 2 + r 2 ) n 1 Then what is the value of ⌈ 3 λ + ln ℘ ⌉
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This problem was disputed by several people, but they offered different values as the correct answer.
I previously updated the answer to 4, based on Deepanshu's initial solution.
After working through it, we realized that the answer should be 3, and the solution is being updated.
Sorry for the confusion which may have arisen from having multiple "The answer has been corrected" emails.
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Edited
ρ = lim n → ∞ ( ∏ r = 1 r = n n 2 n 2 + r 2 ) n 1 ln ρ = lim n → ∞ n 1 ∑ r = 1 n ln ( 1 + ( n r ) 2 ) .
Now Using Riemann Sums :
ρ = lim n → ∞ ( ∏ r = 1 r = n n 2 n 2 + r 2 ) n 1 ln ρ = lim n → ∞ n 1 ∑ r = 1 n ln ( 1 + ( n r ) 2 ) ln ρ = ∫ 0 1 ln ( 1 + x 2 ) d x = l n 2 − 2 + 2 π . . . . ( 1 ) λ = ∫ 0 1 1 + x 3 d x λ = ∫ 0 1 1 + x 3 x 2 + 1 − x 2 d x = 3 1 ∫ 0 1 1 + x 3 3 x 2 d x + ∫ 0 1 ( 1 + x ) ( x 2 + 1 − x ) ( 1 + x ) ( 1 − x ) d x = 3 1 [ l n ( 1 + x 3 ) ] 0 1 + ∫ 0 1 ( x 2 + 1 − x ) 1 − x d x 3 λ = ln 2 + 3 π . . . . . . . . ( 2 ) ⌈ 3 λ + ln ρ ⌉ = ⌈ ln 2 + 3 π + l n 2 − 2 + 2 π ⌉ = 3 .