###
**What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?**

A. 104
B. 140
C. 84
D. 98
**Answer: Option A**

## Show Answer

Solution(By Apex Team)

$\begin{aligned}&S_n=\frac{n}{2}[a+l]\\
&S_{13}=\frac{13}{2}[-10+26]\\
&S_{13}=\frac{13}{2}[16]\\
&S_{13}=104\end{aligned}$

## Related Questions On Progressions

### How many terms are there in 20, 25, 30 . . . . . . 140?

A. 22B. 25

C. 23

D. 24

### Find the first term of an AP whose 8th and 12th terms are respectively 39 and 59.

A. 5B. 6

C. 4

D. 3

### Find the 15th term of the sequence 20, 15, 10 . . .

A. -45B. -55

C. -50

D. 0

### The sum of the first 16 terms of an AP whose first term and third term are 5 and 15 respectively is

A. 600B. 765

C. 640

D. 680