a2 = a1 + r = -10+6= -4
a3 = a1+2r = -10+12 = 2
a4 = a1+3r = -10+18 = 8
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a2 = a1 + r = -10+6= -4
a3 = a1+2r = -10+12 = 2
a4 = a1+3r = -10+18 = 8