Functions and CALL Routines 
Computes the number of combinations of n elements
taken r at a time.

n

is a nonnegative integer that represents
the total number of elements from which the sample is chosen.

r

is a nonnegative integer that represents
the number of chosen elements.
Restriction: 
r n 
The mathematical representation of the
COMB function is given by the following equation:
with n 0, r 0, and n r.
If the expression cannot be computed, a missing value
is returned. For moderately large values, it is sometimes not possible to
compute the COMB function.
SAS Statements 
Results 
x=comb(5,1);

5

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