Question

The sum of the series 6 +66 +666 +... upto "n" terms is
(1) (10n-1-9n +10)/81
(2) 2(10n+l - 9n-10)/27
(3) 2(10n - 9n-10)/27
(4) (10n+1 -9n - 10)/27​

Answer 1

Answer:

(10n-1-9n+10) /81............