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b = 8 - 4 = 4
Un = a + (n - 1)b
= 4 + 4(n - 1)
= 4n
Sn = (n/2)(a + Un)
= (n/2)(4 + 4n)
= (n/2)(4n + 4)
= 2n² + 2n
= 4 + (n-1) 4
= 4 + 4n - 4
= 4n
sn = + (a + )
=
=