Mathegoras

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Ratio of alternating sums

Middle school · ●○○○○ 10 pts

Find the value of 2−4+6−8+10−12+143−6+9−12+15−18+21\frac{2-4+6-8+10-12+14}{3-6+9-12+15-18+21} as a fraction in lowest terms. Give the numerator and the denominator.

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factoring out a common factoralternating sumsfractions