allerySum of first 50 terms of the AP 2, 5, 8, ... is
A3825
B3725
C3775
D3875
Answer & Solution
Correct answer: C. 3775
1. a = 2, d = 3, n = 50.
2. S_50 = 50/2 * (2*2 + 49*3).
3. = 25 * (4 + 147) = 25 * 151.
4. = 3775.
_Source: Selina Concise Mathematics Class 10, Ch on Arithmetic Progression (Mistral OCR'd PDF), section on sum_
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