Should we add the same keyword with all match types in an Ad group?

In last few days, I have received a number of queries related to the “keywords match types” from my visitors. The most common was- should we use the same keyword with all three matching options in one ad group?
So, here is the answer of this query-
Each of your keywords should only appear once in [...]

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This post is in continuation with my previous post Google AdWords Ad Quality & Quality Score for Best Performance.
This post is about how quality score affects our advertising cost.
(Click to find more details about Quality Score)
Here is the formula to calculate the actual Cost per Click (CPC):
Actual CPC = Ad Rank to Beat/ Quality [...]

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