TI-60: Triangle Numbers

[Thomas Klemm]

(12-16-2018 05:33 PM)Dieter Wrote:  In real life, if you want the sum of all integers from 1 to n you'd of course use the direct formula ½n(n+1) or ½(n²+n). Less steps, direct result.

The TI-60 provides an nCr key with a bit weird usage:

Quote:The values of n and r are entered as n.rrr.

Thus we could use:

Code:

+
1.002
=
nCr

Cheers
Thomas