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@freemo I am getting a 120?
@sacha So your saying the answer in the post is correct?
@freemo It took me a couple of minutes to figure out what is going on; if you were pulling my leg, what the different math notations were, if I have become old and stale and then it dawned on me that not all math notations were in the line #3 but continued until the hashtag.
tl;dr: yes
@sacha Easy enough mistake to make i suppose.
@freemo I made the mistake about the placement of the exclamation mark for factorials. ( I until 5 minutes ago) had the notion that its before the value that needs some tlc.