i brought an ipad from a stranger that i have no contact with it is activation protected what shoud i do?

Scratch the basically, you were definitely scammed - as others said, there is absolutely no way to unlock that iPad without the iCloud login (or at the very list the pin code) data of the original owner.

Without the Apple ID and Password of the original owner who set up the device, you will never be able to use it. If you can't get your money back, you can recycle it at any Apple Store. Read this...

The All Too Common SAD Reality of Buying … - Apple Community

Unfortunately you were scammed. Activation Lock will forever prevent your use of that iPad.

Recycle it.