Multiple choice

Three cards are drawn from a bag containing m cards marked $ \displaystyle 1,2,3.....n. $ The probability that they form a sequence is

  1. $ \displaystyle \frac{6}{n\left ( n-1 \right )} $
  2. $ \displaystyle \frac{3}{n\left ( n-3 \right )} $
  3. $ \displaystyle \frac{12}{n\left ( n-2 \right )} $
  4. $ \displaystyle \frac{3}{n\left ( n-1 \right )} $
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C Correct answer

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