Question 49
ProgressionsThe nth term of a sequence is n2 − n − 2. Find the sum of its first and third terms
- A.−2
- B.0
- C.2
- D.4
Show the answer and explanation
Answer: C (2)
Explanation
U₁ = 1 − 1 − 2 = −2 and U₃ = 9 − 3 − 2 = 4, so the sum is 2.
The nth term of a sequence is n2 − n − 2. Find the sum of its first and third terms
Answer: C (2)
U₁ = 1 − 1 − 2 = −2 and U₃ = 9 − 3 − 2 = 4, so the sum is 2.