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`1/(sqrt(2)+sqrt(5))+1/(sqrt(5)+sqrt(8))+1/(sqrt(8)+sqrt(11))+ n`terms is equal to`(sqrt(3n+2)-sqrt(2))/3`b. `n/(sqrt(2+3n)+sqrt(2))`c. less than`n`d. less than`sqrt(n/3)`A. `((sqrt(3n +2))-sqrt(2))/(3)`B. `(n)/(sqrt(2+3n)+sqrt(2))`C. less than nD. less than `sqrt(n/3)` |
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Answer» Correct Answer - A::B::C `1/(sqrt2+sqrt5)+1/(sqrt5+sqrt8)+1/(sqrt8+sqrt(11))+…` n terms `=(sqrt5-sqrt2)/3+(sqrt8-sqrt5)/3+….+(sqrt(5+(n-1)3)-sqrt(2+(n-1)3))/3` `=(sqrt(3n+2)-sqrt2)/3` `=(3n+2-2)/(3(sqrt(3n+2)+sqrt2))` `=n/(sqrt(3n+2)+sqrt2)` `=n/(sqrt(2+3n)+sqrt2)ltn/(sqrt(3n))ltn` |
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