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Question
Using the formula for the sum of first n natural numbers, find 1 + 2 + 3 + ... + 10:
Options
45
50
55
60
MCQ
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Solution
55
Explanation:
The sum of first n natural numbers = `"n(n+1)"/2`.
For n = 10: `"10(11)"/2` = `110/2` = 55.
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