What is the Sum of First 70 even Numbers?
Correct answer: A. 4970
- A. 4970
- B. 4950
- C. 4900
- D. 4980
Explanation
The first 70 even numbers are 2, 4, ..., 140, which can be written as 2(1 + 2 + ... + 70). Since 1 + 2 + ... + 70 = 70 x 71 / 2 = 2,485, the sum is 2 x 2,485 = 4,970. The likely wrong choice is 4,900, which comes from using an incomplete or incorrect sum formula.
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