On 29 Mar, 06:50, "Schizoid Man" wrote:
"joeu2004" wrote in message
"Henry" wrote:
Similarly "=COMBIN(9,3)-84" gives 0.
But "=COMBIN(9,3)-84-0" gives -1.42109E-14

Interesting find! *What that tells us is thatCOMBIN(9,3) is not
returning an integer(!). *Indeed,COMBIN(9,3) returns exactly
83.9999999999999,857891452847979962825775146484375 in IEEE 64-bit
floating point form.

There are several ways to reproduce such errors in Excel. E.g.
NORMSINV(NORMSDIST(0)). Rather than the zero that one would expect, one
gets -1.39213763529183E-16.

Or even NORMSINV(1/2), But you don't usually expect NORMSINV to return
an integer for other values. You do expect COMBIN to do so.