What is 1x1x2x3x4x5x6x7x8x9?

Answer 1

The expression (1 \times 1 \times 2 \times 3 \times 4 \times 5 \times 6 \times 7 \times 8 \times 9) simplifies to (9!) (9 factorial), which equals 362,880. The multiplication of all these numbers results in the product of the first nine positive integers. Thus, the final answer is 362,880.