yer list...2, 6, 10, 14, 18, 22... is a sequens with step size=4... NE regular sequens like this: sum=averaej*(number terms)... number terms=5, so averaej gotta =20.. with 5 terms, yu shood take 20-8, 20-4, 20, 20+4, 20+8... but hav problem...20 is not in yer list... if start at 10, sum=90; if start at 14, sum=110... next tri is tu tri tu inkreez sum bi 10 or kut other sum bi 10... but yu kant duit...if chaenj 1 number, yu chaenj sum bi 4, or 8, or 12... Me konklude...yu kant duit