
06619339
j
2016e.00851
Mahmood, Munir
Mahmood, Ibtihal
A simple demonstration of zero factorial equals one.
Int. J. Math. Educ. Sci. Technol. 47, No. 6, 959960 (2016).
2016
Taylor \& Francis, Abingdon, Oxfordshire
EN
K20
factorial
bound
limit
doi:10.1080/0020739X.2015.1119896
Summary: When asked, a number of students answer zero factorial to be zero as a continuation to the answer of one factorial to be one. Any instructor would then seek a justification of zero factorial to be one from computing ${}_nC_n$ via the wellknown combination formula. This article conveys a simple presentation of zero factorial to be one based on lower and upper bounds of $n$ factorial. We have not seen this explanation covered in any algebra textbook.