Delivery rules and probability: Does a temporarily prohibited banner count for the campaign?

[w-sky]

Hi there, I would like to temporarily replace a banner from a campaign with a different motif and have used the delivery rules for this: The normal banner from this campaign is only displayed before and after the special banner time period, the special banner only within this period.

So that one banner from this campaign is always visible, but a different one during a certain period.

If I now look at the probabilities of the zone, each of the 2 banners from this campaign (supposedly) only has half the probability that it should have: Instead of 25% as there are 4 banners in the zone, both have 12.5% – though one is always inactive due to delivery rules.

My big question: Is that correct, or are the shown percentages incorrect due to my delivery rules?

What happens when Revive's random generator with a 12.5% probability selects the banner that is not currently displayed: Will the other banner from the campaign then be displayed so that it ends up with 25% probability, or will Revive skip this one and randomly select again from all the banners, so that the campaign is reduced to 12.5% probability?

Edited October 7 by w-sky