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Un = 2n + ½n
.
U1 = 2×1 + ½×1
U1 = 2½
.
U2 = 2×2 + ½×2
U2 = 5
.
U3 = 2×3 + ½×3
U3 = 6 3/2 atau 15/2
.
Maka,
3 Suku pertamanya adalah ;
2½, 5, 15/2
.
Semoga membantu
Maaf kalo salah :)