Need clarity on Ad Customizer

Hi,

My scenario is that I have a feed with name ad_customizer which is mapped to campaign Campaign#1. Campaign#1 has two adGroups AdGroup#1 and AdGroup#2.

AdGroup#1 has positive keyword iphone and AdGroup#2 has keyword samsung galaxy.

The contents of feed are:- 

ad_customizer:-

product_name	product_discount	adgroup_targeting
iphone	20	AdGroup#1
samsung galaxy	30	--NOT GIVEN--

I have one ad each per adgroup which is exactly same. The headline of ad is "Buy {=ad_customizer.product_name} with {=ad_customizer.product_discount} % discount"

So ad1 will look like this :- Buy iphone with 20 % discount

and ad2 will look like this:- Buy samsung galaxy with 30 % discount

Now lets say user search for  

Case 1. keyword : iphone 

       Query: What is ad shown? Are  both the ads shown with equal probability or only iphone ad will be shown since feed for samsung galaxy is not mapped to AdGroup#1.

Case 2:- keyword : samsung galaxy

       Query:- Will any ad be shown or both the ad will be shown or only second ad be shown.

This question is to extension of caveat mentioned in the document

https://developers.google.com/adwords/api/docs/guides/ad-customizers

Thanks,

Kainesh

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