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Question

Question: 0.2 + 0.22 + 0.222 + ….. to n terms is equal to...

0.2 + 0.22 + 0.222 + ….. to n terms is equal to

A

29\frac { 2 } { 9 }

B

n – 19\frac { 1 } { 9 } (1 – 10–n)

C

29\frac { 2 } { 9 } [n19(110n)]\left[ \mathrm { n } - \frac { 1 } { 9 } \left( 1 - 10 ^ { - \mathrm { n } } \right) \right]

D

29\frac { 2 } { 9 }

Answer

29\frac { 2 } { 9 } [n19(110n)]\left[ \mathrm { n } - \frac { 1 } { 9 } \left( 1 - 10 ^ { - \mathrm { n } } \right) \right]

Explanation

Solution

.a + .aa + .aaa + ….. n terms

=

.2 + .22 + .222 + ….. n terms

= 281\frac { 2 } { 81 } [9n1+110n]\left[ 9 n - 1 + \frac { 1 } { 10 ^ { n } } \right]