Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Reindex a vector
sum of first 'n' terms
Divide by 4
Basic electricity in a dry situation
old wine in a new bottle?
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Contact your local office