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Black Book Advanced Problems in MathematicsMathematicsFunctions

Number of elements in the range set of f(x) = [ x 15 ] [- 15 x ] x (0, 90) ; (where [ ] denotes greatest integer function) :

Options

  1. A5
  2. B6
  3. C7
  4. DInfinite

Correct answer

B. 6

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