Patterns give rise to problems
Algebra
Level
4
\[\large\sum_{n=1}^{100} 10^n\{2^n+2^{-n}\}\]
If the above summation can be evaluated to be \(\dfrac{a^b-a}{c}\) where \(a,b\) and \(c\) are positive integers and \(a,c\) are coprime, find the value of \(a+b+c\).
Notation: \( \{ \cdot \} \) denotes the fractional part function.
by
Nihar Mahajan