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u1 = a = 10 + 10(1)
= 10 + 10
= 20
u10 = 10 + 10(10)
= 10 + 100
= 110
Sn = n/2 x (a + un)
S10 = 10/2 x (20 + 110)
= 5 x 130
= 650