Question 19
ProgressionsThe nth term of a sequence is n2 − 6n − 4. Find the sum of the 3rd and 4th terms.
- A.24
- B.23
- C.−24
- D.−25
Show the answer and explanation
Answer: D (−25)
Explanation
T3 = 9 − 18 − 4 = −13 and T4 = 16 − 24 − 4 = −12, so the sum is −25.