Question 18
Find the value of $\left(\frac1{20\times25}+\frac1{25\times30}+\frac1{30\times35}+\cdots+\frac1{2015\times2020}\right)\times2020$.
Input: enter the requested whole-number answer without units. Leading zeroes from the paper grid may be omitted.
Input: enter the requested whole-number answer without units. Leading zeroes from the paper grid may be omitted.