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U1 = 1(1 + 1) = 1 × 2 = 2
U2 = 2(2 + 1) = 2 × 3 = 6
U3 = 3(3 + 1) = 3 × 4 = 12
U4 = 4(4 + 1) = 4 × 5 = 20
empat suku pertama adalah 2, 6, 12, 20
U1 = 1 (1+1) = 1.2 = 2
U2 = 2(1+2) = 2.3 =6
U3 = 3 (1+3) = 3.4 = 12
U4 = 4 (1+4) = 4.5 =20
4 suku pertama, 2, 6, 12, 20