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a = 2
b = 3
a) Un = a + (n-1)b
b) U50 = 2 + (50 - 1)3
= 2 + (49)3
= 2 +147
= 149
S50 = 50/2(2.2 + (50 - 1)3)
= 25(4 + (49)3)
= 25(4 + 147)
= 25(151)
= 3775
jumlah 50 suku pertama=149