P→R, R→P, Vector Arithmetic and HP-35

[Gene]

But if you knew the answer in advance - and that was the answer - why ask it as a question?

Rather think through these points and perhaps rephrase it more like this:

“Since the rom capacity of the HP-35 was so limited, I had never realized that functions X Y and Z were left out from the 9100 function set!”

That is better than questions similar to previous ones where you already know the answer?

Then perhaps follow up question or two like these:

Which function do you think was the last one included ?
And
Which was the first one left out?

But asking the question as you did will make people not engage the discussion as they might have because it sounds repetitive to previous questions where you know the reason.

Offered to improve the abilities to foster discussion.