What is the sum of the first 10 consecutive positive integers (1 to 10)?

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A 45
B 50
C 55
D 65

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Answer: C. 55

Explanation: C) 55 is correct because using the mental formula (n(n+1))/2 gives (10 × 11)/2 = 5 × 11 = 55.

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What is the sum of the first 10 consecutive positive integers (1 to 10)?

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