I newly acquired a hp 33S, and tested its speed for nCr operation. I entered the following:

2000 Enter 1000 nCr

and the calculated result : 1.8099e499

I compared with my 32SII. To my surprise, my 32SII showed an Overflow message and displayed 1e500. My 48G displayed 9.999e499. Apparently, the result of 33S is strange. I continued increasing the value, everytime keeping r=n/2, and see how large the number goes before it gives an overflow message, and the result:

2000C1000 = 1.8099e499

3000C1500 = 1.7674e499

5000C2500 = 2.000e499

7000C3500 = 2.2301e499

8994C4497 = 9.9827e499

8995C4497 = Overflow = 1e500

So the largest value for n without getting an overflow message is 8994, with r=n/2=4997. IN all cases, the 32SII gave overflow message. Does anybody have any idea what happens with this nCr operation?

MY second question: I examined my equation library of 33S, and found the following equation preinstalled at the time of buying: V=.25pi d^2 l. This is the equation explained by the 33S manual. Does anybody also have such equation in their 33S? My serial: CNA4110.

KC