Answers

2016-07-13T09:37:12+08:00
1. 2 and 32 [1] a1=2 an=32 n=3 d=? an=a1+(n-1)d 32=2+(3-1)d 32=2+2d 32-2=2d 30=2d 2=2 15=d = 2, 17, 32 2. 6 and 54 [3] a1=6 an=54 n=5 d=? 54=6+(5-1)d 54=6+4d 54-6=4d 48=4d 4=4 12=d = 6, 18, 30, 42, 54 3. 68 and 3 [4] a1=68 an=3 n=6 d=? 3=68+(6-1)d 3=68+5d 3-68=5d -65=5d 5=5 -13=d = 68, 55, 42, 29, 16, 3 4. 10 and 40 [5] a1=10 an=40 n=7 d=? 40=10+(7-1)d 40=10+6d 40-10=6d 30=6d 6=6 5=d = 10, 15, 20, 25, 30, 35, 40
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