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Multiple choice

A bag contains $3$ black, $4$ white and $2$ red balls, all the balls being different. The number of selections of at most 6 balls containing balls of all the colors is

  1. $\displaystyle 42 (4!)$
  2. $ 270 $
  3. $\displaystyle (2^6-1)(4!)$
  4. none of these

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