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
92
B
n – 91 (1 – 10–n)
C
92 [n−91(1−10−n)]
D
92
Answer
92 [n−91(1−10−n)]
Explanation
Solution
.a + .aa + .aaa + ….. n terms
=
.2 + .22 + .222 + ….. n terms
= 812 [9n−1+10n1]