What is the sum of all the numbers between 1 and 31?
- 480
- 496
- 512
- 527
Explanation
To find the sum of all numbers from 1 to 31, use the formula:
Sum = n(n + 1) / 2
Where n = 31
→ Sum = 31(31 + 1) / 2
→ Sum = 31 × 32 / 2 = 496
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- 8.5
- 9
- None of these
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