Can't insert pictures when editing the post above. :-(
I never tried this before, but it looks like Mathcad can at least tell us that the series is bounded above (lower bound 0 is obvious anyway); nte that this does not necessarily mean its convergent.
At least it works when we write 0.5, not with 1/2
But there are two things I don't understand:
I always thought that using a decimal point in symbolic evaluation forces an automatic float, but obviously there is a difference