Telescoping Series 5 – Introducing The Telescope

Algebra Level 1

Given the following, evaluate 11×2+12×3+13×4 \frac{1}{1\times2} + \frac{1}{2\times3} + \frac{1}{3\times4}:

11×2=111212×3=+1213+13×4=+1314 \begin{array}{lllll} & \frac{1}{1\times2}= & \frac{1}{1} & - \frac{1}{2} & &\\ & \frac{1}{2\times3}= & &+ \frac{1}{2} & - \frac{1}{3} & \\ + & \frac{1}{3\times4}=& & & + \frac{1}{3} & - \frac{1}{4} \\ \hline \end{array}

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