Question

To be calculated the next exercise. See below

Answer 1

\[1-\frac{ 1 }{ 3 } +\frac{ 1 }{ 3 ^{2} } - \frac{ 1 }{ 3 ^{3} }\]

Answer 2

@bogdancimpean : It will be more easy for you if you will try
take lcm of all denomenators ie 9,3 and 1

Answer 3

it will come as 9 then solve the qustn