1+2 + 3 + … + 49 + 50 + 49 + 48 + … + 3 + 2 + 1 is equal to:

June 14, 2016 Quiz Questions

1+2 + 3 + … + 49 + 50 + 49 + 48 + … + 3 + 2 + 1 is equal to:
[A]5000
[B]2525
[C]1250
[D]2500

2500
Required Sum =
2\left ( \frac{x\left ( x+1 \right )}{2} \right )+50
=>\frac{2\times 49\times 50}{2}+50=2500
Hence option [D] is the right answer.

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