Railway Recruitment Board Mathematics — Question 1701
Question
What is the average of the first 10 even natural numbers?
- 11
- 10
- 12
- 9
Correct answer
A — 11
Explanation (English)
The first 10 even numbers are 2, 4, …, 20. Average of an evenly spaced list = (first + last)/2 = (2 + 20)/2 = 11.
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