Question

Calculate the following 3+(-3) +3+(-3) +3+(-3) up to 81 terms

Answer 1

Answer:

3

Step-by-step explanation:

We can see that every odd term is +3 and every even term is -3.

Therefore, when we consider 80 terms, we will get 40 odd numbers and 40 even numbers, hence 40*3 and 40*-3

Now 120-120=0. So sum of 80 terms of series will be 0 and 81 being an odd number will have +3 term. Hence sum of the series or value of series is 3