An arithmetic sequence has and common difference . What is ?
Answer and explanation
Correct answer: C.
- Step 1: . Step 2. . **Answer: . Why not the others:** uses instead of , forgets , and is not obtained from the formula.
Practise more Calculus, Sequences, Combinatorics and Probability.
Free questions with an explanation for every one, and full timed Državna Matura (North Macedonia) mock tests.