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Barisan diatas termasuk deret aritmatika
a = 1
b = U₂ - U₁
= 2 - 1
= 1
Un = 750
Un = a + (n - 1)b
750 = 1 + (n - 1)1
750 = 1 + (n)1 - 1(1)
750 = 1 + n - 1
750 = n
n = 750
Sn = [ 2a + (n - 1)b ]
S₇₅₀ = [ 2(1) + (750 - 1)1 ]
= 375 [ 2 + (749)1]
= 375 [ 2 + 749]
= 375[751]
= 268.858