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hp42s-rpn/statitics/README.md
Joerg Elfring 52ec9c241e first commit
2019-02-05 20:33:55 +01:00

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SnCk

Sum of combinations.
The usual nCk function returns the number of combinations for k elements out of n. This program sums up the combinations for 1 .. k out of n.

      k
     ====
     \          1
  n!  >    -----------
     /     k! (n - k)!
     ====
      k = 1