### The nth term of an A.P., the sum of whose n terms is $\mathrm{S}_{\mathrm{n}}$, is

A. $S_{n}+S_{n-1}$ B. $S_{n}-S_{n-1}$ C. $S_{n}+S_{n+1}$ D. $S_{n}-S_{n+1}$ Answer: Option B

### Solution(By Apex Team)

$\mathrm{S}_{\mathrm{n}}$ is the sum of first n terms Last term nth term = $\mathrm{S}_{\mathrm{n}}-\mathrm{S}_{\mathrm{n}-1}$

A. 22
B. 25
C. 23
D. 24

A. 5
B. 6
C. 4
D. 3

A. -45
B. -55
C. -50
D. 0