code: def logChoose(n, c):
      return lgamma(n + 1) - lgamma(c + 1) - lgamma(n - c + 1)
  
imports: import sys
  import math
  from nupic.bindings.math import GetNTAReal, GetNumpyDataType, SparseMatrix, SparseTensor, TensorIndex, Domain
  from nupic.bindings.math import lgamma, erf
label_desc: Use image node_id 2 for calling a global function with example usage: logChoose(n, c) and returns: unknown