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XAT 2017 — QA & DI Question 1

Arithmetic ProgressionEasy

The sum of the series, (-100) + (-95) + (-90) + … + 110 + 115 + 120, is

Answer & solution

  • A

    0

  • B

    220

  • C

    340

  • 450

  • E

    None of the above

Solution

(–100) + (-95) + ….. + 120

= [(–100) + (-95) + ….. + 95 + 100] + 105 + 110 + 115 + 120

= 105 + 110 + 115 + 120 

= 450

Hence, option (d).

XAT 2017 QA & DI Q1: The sum of the series, (-100) + (-95) + (-90) + … + 110 + 115 + 120, is — Solution | TheCATExam