Maximum value of sum of arithmetic progression $50, 48, 46, 44 ........$ is :-

Find the $7^{\text {th }}$ term in the following sequence whose $n^{\text {th }}$ term is $a_{n}=\frac{n^{2}}{2^{n}}$

If three numbers be in $G.P.$, then their logarithms will be in

The sum of $1 + 3 + 5 + 7 + .........$ upto $n$ terms is

Write the first three terms in each of the following sequences defined by the following:

$a_{n}=2 n+5$

If $a,b,c$ are in $A.P.$, then $\frac{1}{{\sqrt a + \sqrt b }},\,\frac{1}{{\sqrt a + \sqrt c }},$ $\frac{1}{{\sqrt b + \sqrt c }}$ are in