- A8
- B22
- C10
- D11
Step-by-Step Solution
For three terms in AP the middle one is the average of the other two: . 8 is 15 − 7; 22 forgets to halve.
Answer: D) 11
The numbers 7, and 15 are in AP. Find .
Class 10Properties and Selection of AP TermsAlgebra — Sequences
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Properties and Selection of AP Terms practice questions
More Class 10 Properties and Selection of AP Terms practice
If a, b, c are in AP, which relation must hold?Every term of the AP 3, 7, 11, 15, … is increased by 5. What is the common difference of…Each term of the AP 2, 5, 8, 11, … is multiplied by 3. What is the common difference now?For what value of k are 2k + 1, 13 and 5k − 3 three consecutive terms of an AP?Three numbers in AP add up to 24. What is the middle number?