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a = 1
b = 5 - 3 = 2
Un = 153
a + (n-1)b = 153
3 + (n-1)2 = 153
2n - 2 = 150
2n = 152
n = 76
Sn = n/2(a + Un)
S76 = 76/2(3 + 153)
= 38(156)
= 5928