If lim(n to oo) sum(k=2)^(n)cos^(-1)((1...

If `lim_(n to oo) sum_(k=2)^(n)cos^(-1)((1+sqrt((k-1)(k+2)(k+1)k))/(k(k+1)))=(120pi)/(lambda)`, find the value of `lambda`.

A

700

B

720

C

760

D

None of these

Verified by Experts

The correct Answer is:

B

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