Calculate the sum:

5 + (−5) + 5 (−5) + .....

(i) if the number of terms is 10.
(ii) if the number of terms is 11.

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Solution

(i) If the number of terms is 10, then 5 + (−5) + 5 + (−5) + 5 + (−5) + 5 + (−5) + 5 + (−5) = 0.
(ii) If the number of terms is 11, then 5 + (−5) + 5 + (−5) + 5 + (−5) + 5 + (−5) + 5 + (−5) + 5 = 5.

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Similar questions

Calculate the sum: $5 + (- 5) + 5 + (- 5) + . . . . . .$
(a) If the number of terms is $10$
(b) If the number of terms is $11$ .

5 + (- 5) + 5 + (- 5) + . . .

2 + 5 + 8 + 11.....

60100

19 + 18 \frac{1}{5} + 17 \frac{2}{5} + . . .

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