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a1=1
a9=49
49=a1+(9-1)*r
49=1+8r
48=8r
r=6
1,7,13,19,25,31,37,43,49
2.
a3=6
a5=54
a3*q^2=54
6q^2=54
q^2=9
q=3 v q=-3
a1=6:3^2=6/9=2/3
q=3 v q=-3
a1=2/3