MCQ
Express $9^2$ as the sum of two consecutive integers.
- ✓$40 + 41$
- B$50 + 31$
- C$36 + 45$
- D$72 + 9$
✓
Answer
Correct option: A.
$40 + 41$
$\frac{9^2-1}{2}=40, \frac{5^2+1}{2}=41$
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