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

## Solution

The only three-digit integers that can be formed are 111,112, 121, 122, 211, 212, 221, 222. The sum of these integers is 1332 .

ANSWER: (A)