The sum of 100 terms of the series 1 – 3 + 5 – 7 + 9 – 11 ………. is:
a) 100
b) -200
c) 200
d) -100
Answer: d
Explanation: 1 – 3 + 5 – 7 + 9 – 11 ………. + 197 – 199
= (- 2) + (-2) + (-2) + ………. + (-2) (50 times)
= 50 × (-2) = -100
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