Find the mean of the first $n$ terms of the $A$.$P$. $a, (a + d), (a + 2d), \dots$

Let $S_n$ denote the sum of the first $n$ terms of an $A.P$. If $S_4 = 16$ and $S_6 = -48$,then $S_{10}$ is equal to

The median of all $4$-digit numbers that are divisible by $7$ is

If the roots of the equation $x^3 - 12x^2 + 39x - 28 = 0$ are in $A.P.$,then their common difference will be

Let $a_n, n \geq 1$,be an arithmetic progression with first term $2$ and common difference $4$. Let $M_n$ be the average of the first $n$ terms. Then the sum $\sum_{n=1}^{10} M_n$ is

Insert five numbers between $8$ and $26$ such that the resulting sequence is an $A.P.$