Multiple choice The sum of n terms of the series 4 + 44 + 444 + .... is (4 /81) [10n+1 - 9n - 1] (4 /81) [10n+1 - 9n - 1] (4 / 81) [10n+1 - 9n - 10] (4/81) [10n - 9n - 10] Reveal answer Fill a bubble to check yourself C Correct answer Explanation