He placed 512 counters in the tenth box
Because... If you do a (number pattern aka a list of numbers that follow a certain sequence or pattern) your pattern will be 1,2,4,8,16,32,64,128,256,512, So in the tenth box it will be 512 because I did the pattern and reached the tenth number, which is 512 so me and Avajcantu are correct.
You can also say 2 to the power of 9 or 10 to get 512 it’s the same thing. ⇒I hope this helped <3 and don’t copy without permission thank you!