CAT 2019 Slot 2 Solutions Quantitative Aptitude | Value of 1+2+3+...+n | Question and Answer

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If (2n+1) + (2n+3) + (2n+5) + … + (2n+47) = 5280 , then what is the value of 1+2+3+...+n ?
[TITA]

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Best wishes for CAT preparation.

[TheAdhi]

At 2:12 you say sum of first N natural numbers is n^2 . You mean sum of first n odd natural numbers right?

[akshaybhardwaj]

How is sum of odd digits till 47 is 24^2 ?