Why is the number of rows in the select * from A cross join B query 16?

Question

SQL

I tried to solve the problem here t.me/sqljuniorschool and I don't understand why the maximum number of query strings select * from A cross join B is 16? Tables A and B have 4 terms.

Answer 1

Because the maximum result can be such row sets:
A1+B1, A1+B2, A1+B3, A1+B4
A2+B1, A2+B2, A2+B3, A2+B4
A3+B1, A3+B2, A3+B3, A3+B4
A4+B1, A4+B2, A4+B3, A4+B4