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text  l.  end text straight f to the power of nnn straight C subscript straight r minus 1 end subscript equals 36 comma straight C subscript straight r equals 84 comma straight C subscript straight r plus 1 end subscript equals 126 then (n, r)=

  1. (9,6)
  2. (9,5)
  3. (9,3)
  4. (9,2)

The correct answer is: (9,3)


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