Let ||X|| be defined as the sum of the i...

Let `||X||` be defined as the sum of the integers from 1 to x, inclusive. Which of the following equals `||21||-||20||`?

A

`||1||`

B

`||5||`

C

`||6||`

D

`||21||`

Verified by Experts

The correct Answer is:

C

Similar Questions

Explore conceptually related problems

What is the sum of all the integers from 20 to 100, inclusive?

Is the sum of the integers from 54 to 153, inclusive, divisible by 100?

The sum of the integers from 1 to 100 which are not divisible by 3 or 5 is

Let [x] be defined by the equation [x] = (x^2)/2 . Then which one of the following equals 2?

Let f:R->[-1, 1] be defined as f(x) = cos(sin x), then which of the following is(are) correct ?

Let f : R ->R defined by f(x) = min(|x|, 1-|x|) , then which of the following hold(s) good ?

If x is a positive integer such than x^(9)-r and x^(5)=w, which of the following must be equal to x^(13) ?

Let function f(x) be defined as f(x) = |sin^(-1)x| + cos^(-1) (1/x) . Then which of the following is /are TRUE.

Let f:R rarr R defined by f(x)=cos^(-1)(-{-x}), where {x} denotes fractional part of x. Then, which of the following is/are correct?

Let f: R to R be a function defined by f(x)="min" {x+1,|x|+1}. Then, which of the following is true?