A 1- a 2- a 3- a n are in an A-P- 1 - a 1 - a 2 - 1 - a 2 - a 3 - 1 - a n-1 - a n - n-1 - a n - a 1

1 √( a _ 1 ) +√( a _ 2 ) #160; + 1 √( a _ 2 ) +√( a _ 3 ) #160; +....+ 1 √( a _ n 1 ) +√( a _ n ) #160; Let S be the Sum and d be the c ...

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Sum of n Terms

a 1, a 2, a...

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$a_{1}$ , $a_{2}$ , $a_{3}$ ,....., $a_{n}$ are in an $A . P .$
$\frac{1}{\sqrt{a_{1}} + \sqrt{a_{2}}} + \frac{1}{\sqrt{a_{2}} + \sqrt{a_{3}}} + . . . + \frac{1}{\sqrt{a_{n - 1}} + \sqrt{a_{n}}} = \frac{(n - 1)}{\sqrt{a_{n}} + \sqrt{a_{1}}}$

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