2.1.921 Part 4 Section, BETAINV

a.   The standard states that if probability < 0 or probability > 1, #NUM! is returned.

Office returns #NUM! if probability <= 0 or probability >= 1.

b.   The standard does not place a restriction on the relationship between argument A and argument B.

Office returns #NUM! if argument A is greater than or equal to argument B.

c.   The standard specifies that BETAINV uses an iterative search technique.

Office does not require an iterative search technique to be used.