Transfer paid apps FROM iTunes to iPhone on mac?

I have some paid apps on my mac which I would like to transfer to my iPhone. But every time I sync the phone it says so-and-so app can't be synced. Free apps can be transferred without any problems, but its the paid apps which I want on my phone. If there's a software, please name it As soon as possible.

You just have to sign in the same account your mac is signed into(itune username/password)

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