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NDA2013MathematicsPermutation and CombinationActual

If P (77,31)=x and C (77,31)=y , then which one of the following is correct?

Options

  1. Ax=y
  2. B2 x=y
  3. C77 x=31 y
  4. Dx y

Correct answer

D. x y

Step-by-step solution

x=(31!y) x y

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