Let the sequence form an AP. Then
Explanation for the correct option:
Finding the sequence:
Given is the sequence in A.P.
Then the common difference '' in A.P. is defined as,
To find the value of .
Finding the value of the above expression using the algebraic identity for every two terms.
Since we get,
No we know that the nth term of an A.P. can be written as,
Using the above equation and find '',
Substitute the obtained value of '' in .
Therefore, the value of is equal to .
Hence, option (A) is the correct answer.