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MHT CET2010MathematicsProbability

A four digit number is to be formed using the digits 1, 2, 3,4,5,6,7 (no digit is being repeated in any number). Then, the probability that it is >4000 , is

Options

  1. A3 / 2
  2. B1 / 2
  3. C4/7
  4. D3 / 7

Correct answer

C. 4/7

Step-by-step solution

Total cases = ⁷ P₄=840 Favourable cases =4 6 5 4=480 Required probability = 480 840 = 4 7

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