Question

-635 from 0
3. Calculate the sum.
2 + (-2) + 2 + (-2) + 2 + (-2) +.?
(i) If the number of terms is 125.
[Hint: Pair the numbers.]
(ii) If the number of terms is 140.​

Answer 1

0

i) IF THE SUM OF THE FIRST p TERMS OF AN A.P. IS q AND SUM OF FIRST q TERMS IS p SHOW THAT THE SUM OF FIRST p + q TERMS IS - (p + q).

ii) IF THE SUM OF THE FIRST p TERMS OF AN A.P. IS q AND SUM OF FIRST q TERMS IS p SHOW THAT THE SUM OF FIRST p + q TERMS IS - (p + q).