"Identifying ARITHMETIC or GEOMETRIC PROGRESSION. An arithmetic progression has a constant difference between terms: TERM#C - TERM#B = TERM#B - TERM#A A geometric progression has a constant ratio between terms: TERM#C / TERM#B = TERM#B / TERM#A If one enters the first 3 or any 3 consecutive terms: TERM#A, TERM#B and TERM#C,then YESARPRO = 1 if an ARITHMETIC progression with common difference COMMDIFF and YESGEOPR = 1 if a GEOMETRIC progression with common ratio COMMRATIO. *** Answers to problem *** (a) Set TERM#A=3, TERM#B=6 and TERM#C=12. Because YESGEOPR=1, this is a geometric progression with a common ratio COMMRATI=2. (b) Set TERM#A=-16, TERM#B=-12 and TERM#C=-8. Because YESARPRO=1, this is an arithmetic progression with a common difference COMDIFF=4. || (a) Three consecutive terms of a progression are: 3, 6 and 12. Is this a geometric or arithmetic progression? (b) Do three consecutive numbers: -16, -12, -8 form a progression? Type comma key to see answers. Type (F2) to return to helpfile. '' (c) PCSCC, Inc., 1993"
