Sum of series:
is equal to?
I don't think this is a fair GMAT question, but I believe the answer is:
(10(10^n - 1)/9 - n)/9
Former Senior Instructor, Manhattan GMAT and VeritasPrep
Vice President, Midtown NYC Investment Bank, Structured Finance IT
MFE, Haas School of Business, UC Berkeley, Class of 2005
MBA, Anderson School of Management, UCLA, Class of 1993