Question

Calculate the sum :
3+(-3)+3+(-3)+3+(-3) + ..
(a) If the number of terms is 40.
(b) If the number of terms is 71.​

Answer 1

Answer:

The answer for a:-0

The answer for b:-3

Step-by-step explanation:

If we consider 4 terms then

3+(-3)+3+(-3) The answer = 0

So if we consider any even no of terms the answer is 0

If we consider 5 terms then

3+(-3)+3+(-3)+3 The answer is 3

So if we consider any even no of terms the answer is 3..

So answer for a is 0 and b is 3

Answer 2

Answer:

if we consider 3+(-3) as one term

if number of terms is 40 then answer is 0

if number of terms are 71 then answer is 0

if we consider 3 and -3 as seperate terms

if number of terms are 40 then answer is 0

if number of terms are 71 then answer is 3