Question

12. Calculate the sum : 9+(-9) + 9 + (-9) +9+(-9) +
6) If the number of terms is 221.
(i) If the number of terms is 450.
please explain step by step​

Answer 1

answer is 1 hope it was not help you

Answer 2

Answer:

9+(-9)+9+(-9)+9+(-9)....

if the number of terms is 221 means odd number then result is 9 because every two terms make zero.so sum of 220 terms is zero then 1 term is 9

if the number of terms is 450 means even, then results is zero