Question 46

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

Solution

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The given series is (-100)+ (-95)+ (-90)+....+110 + 115 + 120. 
We can observe that -100 will cancel out 100, -95 will cancel out 95 and so on. Therefore, the only terms that will be remaining are 105, 110, 115 and 120.
Sum of the series = 105 + 110 + 115 + 120 = 450.
Therefore, option D is the right answer.

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