Bunuel wrote:
What is the difference of the sum from 26 to 50, inclusive and the sum from 1 to 25, inclusive?
(A) 500
(B) 525
(C) 600
(D) 625
(E)800
The sum of all integers from 1 to 50, both inclusive =\(\frac{ 50 * 51}{2}\)
The sum of all integers from 1 to 25, both inclusive =\(\frac{ 25 * 26}{2}\)
The sum of all integers from 26 to 50, both inclusive =\(\frac{ 50 * 51}{2} -\frac{ 25 * 26}{2}\)
Question-
What is the difference of the sum from 26 to 50, inclusive and the sum from 1 to 25,inclusive
\(\frac{ 50 * 51}{2} -\frac{ 25 * 26}{2} -\frac{ 25 * 26}{2}\)
\( (25 * 51) - (25*13) -(25*13)\)
\( 25 * (51 -26)\)
\( 25 *25\)
\(625\)
OptionD
...
Statistics : Posted by gmatophobia • on 27 Aug 2023, 11:00 • Replies 1 • Views 85
