alleryIf a_n = 3 n + 5, the first three terms are
A8, 11, 14
B5, 8, 11
C3, 6, 9
D8, 13, 18
Answer & Solution
Correct answer: A. 8, 11, 14
1. Plug n = 1: a_1 = 3 + 5 = 8.
2. n = 2: a_2 = 6 + 5 = 11.
3. n = 3: a_3 = 9 + 5 = 14.
4. So the AP starts 8, 11, 14.
_Source: Selina Concise Mathematics Class 10, Ch on Arithmetic Progression (Mistral OCR'd PDF), section on nth term formula_
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