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Text File  |  1993-10-02  |  2KB  |  15 lines

  1. "AST1CAL3 EQUATION VARIABLE","10-02-1993","09:43:04"
  2. "YESARPRO=1-SIGN(ABS((TERM#C-TERM#B)-(TERM#B-TERM#A))) COMMDIFF=(TERM#C-TERM#B)*YESARPRO YESGEOPR=1-SIGN(ABS(TERM#C/TERM#B-TERM#B/TERM#A)) COMMRATIO=(TERM#C/TERM#B)*YESGEOPR"
  3. "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"
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