The function f(x) is defined as x - 10[ x10]. ([x] is the greatest integer less than or equal to x). What is f(7) + f(7^2) + f(7^3) +…+ f(7^2020)?

The function f(x) is defined as x - 10[ x10]. ([x] is the...

Free Practice Question

PS · Problem Solving

705-805

Functions

The function

f(x)

is defined as

x - 10[\frac{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})

?

Get detailed analytics, unlock full explanations, and move up difficulty tiers as you practice.

Explanation

Create a free account to reveal the correct answer, see the step-by-step explanation, and start tracking your GMAT progress.

Comments

Sign in to join the discussion

Be the first to share your thoughts and help others understand it better.