A:AnswerItll work its just the wrong size for it. Get it off amazom they come in 2 packs just search for Samsung tablet stylus with your model number and check the devices supported so you know if it fits or not in the hole.
A:AnswerDo not buy it. Will not work. In defence of stylus the a51 is real picky with stylus Manufacturers. Samsung has a new. One out that gives full function and costs around $100.
A:AnswerYes, it should work because the standard pen included with the Note 10 will work with the Note 20 so this being a Note 10 compatible model it should also work.