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  1. \({18 \choose 9}\text{.}\)

  2. \(\binom{12}{7}\binom{6}{2} \text{.}\)

  3. \(\displaystyle {18 \choose 9} - {3 \choose 1}{14 \choose 8}\)

  4. \(\displaystyle {3\choose 1}{15 \choose 8} + {12 \choose 7}{6 \choose 2} - {3\choose 1}{9 \choose 6}{6 \choose 2}\)

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