Question: 1. On the other hand, what if we wanted to place nine 4s onto a Sudoku board without reusing rows or columns? (Again, we will ignore the fact that on a Sudoku board, a player also cannot have two of the same number appear in the same 3 × 3 block.) How many different ways would there be to make that placement?
2. How many orderings are there of a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p?