If an advertiser has the same keyword in two different ad groups, the one to win a given auction will be the keyword with the:



If an advertiser has the same keyword in two different ad groups, the one to win a given auction will be the keyword with the:
  • highest maximum cost-per-click (CPC) bid.
  • most historical data in the account.
  • best Quality Score.
  • highest Ad Rank.
The correct answer is:
  • highest Ad Rank.
Explanation: When several broad match keywords in your ad group broadly match a search term, the system will prefer to use the keyword with the highest Ad Rank.
Read more here: 
https://support.google.com/adwords/answer/2756257?hl=en

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