Question

Choose the correct statements -

• A. AP can be written as a, (a+d), (a+2d), (a+3d), .........
  
• B. List of integer forms an A.P.
• C. $n^{th}$ term in A.P. can be written as $S_n-S_{n-1}$ where $S_n$ means sum of n terms
• D. If the nth term of the A.P. is $l$, then $S=\frac{n}{2}[a-l]$

Answer 1

Answer: (A), (B), (C)

The correct options are
A AP can be written as a, (a+d), (a+2d), (a+3d), .........
B List of integer forms an A.P.
C $n^{th}$ term in A.P. can be written as $S_n-S_{n-1}$ where $S_n$ means sum of n terms

AP can be written as a, (a+d), (a+2d), (a+3d), .........
List of integer form an A.P.
$n^{th}$ term in A.P. can be written as$S_n-S_{n-1}$ where $S_n$ means the sum of n terms.
If the nth term of the A.P. $l$, then $S_n=\frac{n}{2}[a+l]$