Seeing binary as ternary

How many numbers in the following list of 15 numbers are a multiple of 3:

\[ \begin{array} {l} 1, 10, 11, 100, 101, 110, 111, 1000 \\ 1001, 1010, 1011, 1100, 1101, 1110, 1111 \\ \end{array} \]

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