Let us write the multiplies out in full. . That is 1 n 2 t h.
The circle intersects the real axis at 2 11-12 when th 0 and at 23 11--12 when th 180 degrees.
Called n factorial is the product of the first n natural numbers 1 2 3 n and where 0. Called n factorial is the product of the first n natural numbers 1 2 3 n and where 0. The 4 3 2 1 cancelled out leaving only 7 6 5. The factorial operation is encountered in many areas of mathematics notably in combinatorics.