Question

13. Calculate the sum : 9+(-9)+9+(-9)+9+(-9)+.....
(i) If the number of terms is 221.
(ii) If the number of terms is 450.​

Answer 1

Answer:

(i)0

(ii)0

Step-by-step explanation:

Given that,

9+(-9)+9+(-9)+9+(-9)+...... _____(1)

here

9+(-9)=0 =(0)+[9+(-9)]=0+0=0

So,

from (1) ,

9+(-9)+9+(&9)+9+(-9)......=0+0+0+....... ______(2)

(i) no.of terms is 221 then

it goes from (2)

=>0×221=0

(ii) no.of terms is 450 then

it goes from (2)

=>0×450=0