What is the 25th term of the arithmetic sequence 7, 11, 15, 19, ...?
Answer and explanation
Correct answer: D. 103
- Step 1: First term a1 = 7, common difference d = 4. Step 2. Formula: an = a1 + (n - 1)d. Step 3. a25 = 7 + (24)(4) = 7 + 96 = 103. Answer: 103. Why not the others: 99 uses n - 2 instead of n - 1.
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