A selection is to be made for one post of Principal and two posts of Vice-Principal. Amongst the six candidates called for the interview, only two are eligible for the post of Principal while they all are eligible for the post of Vice-Principal. The number of possible combinations of selectees is

  • 4
  • 12
  • 18
  • None of the above

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 A selection is to be made for one post of Principal and two posts of Vice-Principal. Amongst t
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