The following is true:
COMB(n, 2) + n = Sum of all integers from 1 to n
i.e. if n = 5
COMB(5, 2) + 5 = 5! รท (3!*2!) + 5 = 10 + 5 = 15
and
1 + 2 + 3 + 4 + 5 = 15
However, when I input
'COMB(5,2) + 5' on one level,
and '[Capital Sigma symbol](X=1,5,X)' on the other,
and I execute the == command on the Program-Test Menu, I get a 0 as a result (incorrect result)
Both objects inputed are same type (9 - algebriac expressions?).
A bug in the 49g+ CAS perhaps.