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Consider the following statements about the gamma function. 1. It extends the factorial to non-integer arguments   2. \( \Gamma(1/2) = \sqrt{\pi} \)   3. It satisfies \( \Gamma(n) = n\,\Gamma(n+1) \)

  • A.2 and 3 only are correct
  • B.1, 2 and 3 are all correct
  • C.1 and 2 only are correct
  • D.1 and 3 only are correct

Answer: C

The first two hold. The third has the recursion inverted: the correct relation is \( \Gamma(n+1) = n\,\Gamma(n) \), so the gamma of the *larger* argument carries the factor. Written the other way it would make the function decrease along the integers instead of growing like the factorials

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