Three-digit integers are formed using only the digits 1 and/or 2. The sum of all such integers formed is
Answer Choices
A. 1332
B. 333
C. 999
D. 666
E. 1665
Three-digit integers are formed using only the digits 1 and/or 2. The sum of all such integers formed is
Answer Choices
A. 1332
B. 333
C. 999
D. 666
E. 1665