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a)
a₂= a₁+r
a₄=a₁+3r
a₁+r = 2
a₁+3r = 6
-2r = -4
r =2
a₁+2=2
a₁=0
b)
a₁+r=0
a₁+4r=9
-3r=-9
₁=3
a₁+3=0
a₁=-3
c)
a₁+3r=2
a₁+9r=-10
-6r=12
r=-2
a₁+-6=2
a₁=8