Question

For p, q, r, s to be the terms of an arithmetic progression, the required condition is.

• A. q - p =s - r
• B. q + p = s + r
• C. p - q = s - r
• D. q + p + r = s

Answer 1

The correct option is A q - p =s - r

If the difference between the second term and the first term is equal to the difference between the third term and the second term and so on, the numbers are said to be in AP.

Hence, if p, q, r, s are in AP, then q - p = r - q = s - r

Thus, the correct answer is q - p = r - q = s - r