LCM of 6,12,20, and so on?
Algebra
Level
3
\[ \dfrac{1}{1} - \dfrac{5}{6} + \dfrac{7}{12} - \dfrac{9}{20} + \dfrac{11}{30} - \dfrac{13}{42} + \dfrac{15}{56} - \dfrac{17}{72} + \dfrac{19}{90} \]
If the expression above is in the form of \( \frac a b \) for coprime positive integers \(a,b\), find \(a+b\)?
by
U Z