When competing for the same ad unit, if the Ad Rank of a cost-per-thousand impressions (CPM), placement-targeted ad is higher than the combined Ad Rank of all competing keyword-targets ads, then the:

When competing for the same ad unit, if the Ad Rank of a cost-per-thousand impressions (CPM), placement-targeted ad is higher than the combined Ad Rank of all competing keyword-targets ads, then the:

Answer -  placement-targeted ad will be the only ad to appear in the unit.