How many ad groups are in a campaign?

Did you know that an AdWords account can contain as many as 10,000 campaigns (includes active and paused campaigns) per account, 20,000 ad groups per campaign, and 50 text ads per ad group? That’s a lot to manage! Fortunately, you can manage your campaigns and ads from just two places in your account.

For More Information Please Refer: https://www.quora.com/What-is-the-maximum-number-of-campaigns-and-ad-groups-you-can-create-in-Adwords