# Calculate the following products with W|A app on a phone device?

GROUPS:
 Hi i would like to know how to calcul this kind of SUM in Mobile version Wolfram alpha ( iOS 10.2 ), thx i know about sum ( sum x=y, k=y to infinity ) for exaple but idk this types =\
 Daniel Lichtblau 2 Votes Could enter e.g. product (4k, k=1 to n )