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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: A Complex Metaphysical Conundrum
Date: Wed, 10 Apr 2024 15:57:55 -0400
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"Cursitor Doom" <cd@notformail.com> wrote in message 
news:c6hd1jdjimga6ifo7b0kv7bqfj9750lbk3@4ax.com...
> Gentlemen,
>
> This is an exam question that trips up even some of the best students.
> See what you make of it!
>
> Q: Is this statement correct: 'The signal level at the modem input
> increased by 2dBmV going from +3dBmV to +5dBmV.'
>
> Your pal, CD.

Changing a signal level can be thought of as multiplying the signal by a 
constant.
That constant can't have units because then you'd have (dBmV)^2

So that answer is likely to be that the increase is by 2 dB not 2 dBmV