In an $AP$,if $a = 3.5, d = 0, n = 101$,then $a_{n}$ will be

The $26^{\text{th}}$,$11^{\text{th}}$,and the last term of an $AP$ are $0$,$3$,and $-\frac{1}{5}$,respectively. Find the common difference and the number of terms.

$A$ class has $49$ students who are allotted roll numbers from $1$ to $49$. Find a roll number $n$ such that the sum of all the roll numbers smaller than $n$ is equal to the sum of all the roll numbers greater than $n$.

For a given $A.P.$,$S_{n} = 5n^{2} + 8n$. Hence $T_{n} = \ldots \ldots \ldots \ldots$

The difference between two consecutive terms of an $A.P.$ is denoted by.........

The sum of the first $n$ terms of an $AP$ whose first term is $8$ and the common difference is $20$ is equal to the sum of first $2n$ terms of another $AP$ whose first term is $-30$ and the common difference is $8$. Find $n$.