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WBCS Main Examination 2023 — Paper VI: Arithmetic and Test of Reasoning · Question 99 of 200

Q99
ArithmeticNumber Series & Progressions
$\sum_{i=1}^{10} (10 \times i) = ?$
  1. a.650
  2. b.450
  3. c.550
  4. d.750

Answer: (C) 550

The sum is $10 \times (1 + 2 + \cdots + 10) = 10 \times 55 = 550$. 450 stops at $i = 9$, and 650 adds an extra 100.

Q98 Whole paperQ100