Which one is correct?

[snade17]

Hello, Could you tell which of the following sentences is correct, if any:
1. I admit making/doing a mistake.
2. I admit to have made a mistake.
3. I admit having done/made a mistake.

[Humble]

Hi, Shade,
I admit making=having made a mistake.
Admit takes the Gerund, not the Infinitive.
Cheers

[snade17]

Thank you for your quick reply.

[Humble]

You are welcome.