Function f(x) is defined as x-10(x/10) . ([X] is the greatest integer less than or equal to x). What is f(7)+f(7^2)+f(7^3)+.....f(7^2020)

Answer 1

Was this question uploaded correctly? It says

f(x) = x - 10(x/10)

But

x - 10(x/10) = x - x = 0

So f(x) = 0 for ALL x and there is nothing to solve for here.