Let be in A.P. If and , then is equal to...

Given are in AP. Find and From the given conditions: Subtracting (2) from (1): Substituting into (2): By rationalizing each term, W...

Let a_{1},a_{2},.,a_{n} be in A.P. If a_{5} = 2a_{7} and a_{11} = 18, then 12( \frac{1}{\sqrt{a_{10}} + \sqrt{a_{11}}} + \frac{1}{\sqrt{a_{11}} + \sqrt{a_{12}}} + .. + \frac{1}{\sqrt{a_{17}} + \sqrt{a_{18}}} ) is equal to : Sequence & Series (Mathematics)

Let

a_{1},a_{2},\ldots.,a_{n}

be in A.P. If

a_{5} = 2a_{7}

and

a_{11} = 18

, then

12\left( \frac{1}{\sqrt{a_{10}} + \sqrt{a_{11}}} + \frac{1}{\sqrt{a_{11}} + \sqrt{a_{12}}} + \ldots.. + \frac{1}{\sqrt{a_{17}} + \sqrt{a_{18}}} \right)

is equal to