MATH 105 Lecture Notes - Lecture 2: Mirror Image, Eulerian Path, Hamiltonian Path

• School: University of Arizona
• Department: Mathematics Main
• Course: MATH 105
• Professor: Debra Wood

Document Summary

If you want to write something as a factorial write the number x and then add ! . Let"s say the number is 5 5 factorial is written as 5! By hand : 5 x 4 x 3 x 2 x 1 = 120. This method will find the factorial a little faster but not by much, but it is handy when dealing with larger number. Let"s say the teacher gives you 199! / 201! In this case, because both numbers contains at least 199!, you can cancel them out. Why? because part of the denominator (all previous numbers leading up to 199, which is written as 199!) and the entire numerator (199! Another way to explain this is that you could have taken out . Because 17 out of 20 leaves you with 18, 19, ad 20. Multiply 20 x 19 x 18 = 6,840. Circuits works slightly differently in this unit.