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a = 1002
b = U₁ - U₂ = 1004 -1002 = 2
Un = a + b (n - 1)
1016 = 1002 + 2 (n - 1)
1016 = 1002 + 2n - 2
-2n = 1002 - 2 - 1016
-2n = -16
n =
n = 8
Sn =
S₈ =
S₈ = 4 (2004 + 14)
S₈ = 4 x 2018 = 8072