The sum of the first terms of an arithmetic sequence is . What is the common difference?
Answer and explanation
Correct answer: C.
- Step 1: and . Step 2. . **Answer: . Why not the others:** : is the coefficient of and not the difference. : is the first term. : is the second term.
Practise more Sequences and complex numbers.
Free questions with an explanation for every one, and full timed Pancyprian Examinations (Cyprus) mock tests.