In the beginning, I’m sorry for my bad English.
I tried to create a new type of the Calcudoku puzzle: 5×5 "multiop" with "!".
This one should contain all of operations, which we know here (
except negative numbers, though it isn’t operation), + factorial.
Operations "+", "–", "×", ":", "^", "|" and "mod" work as usually; both "factorial" cages show
result of multiplicated cells (no sum).
For example: n! / 10 in 3-cells cage (in 5×5) >>> possible results: only 12 (120/10 = (2 × 3 × 4 × 5)/10; 72 is impossible);
thus combinations 1 × 3 × 4 and 2 × 2 × 3.
Note: Variables "a" and "b" can be different or identical; a, b ε N, of course.
Good luck for solving…