The binomial theorem states that an expression of the form (a x + b y)^{ n} may be expanded as follows.
(ax + by)^{ n} = (ax)^{ n} + n (ax)^{ n  1} (by) + ...
+ n C r (ax)^{ n  r} (by)^{ r}+ ... + (by)^{ n}
where a and b are coefficients, n is a positive integer.
The general coefficient n C r is given by
n C r = n! / [(n  r)! r!]
How to use the calculator
1  Enter coefficients a and b and n as a positive integer then press "enter".
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