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Verified answer
Barisan AritmatikaDiketahui :
a = 1,2 m
U5 = 2,4 m
Panjang bambu sbelum dipotong (S5)
Sn = (n/2)(a + Un)
S5 = (5/2)(1,2 + 2,4)
S5 = 5/2 × 3,6
S5 = 5 × 1,8
S5 = 9 m ➡ opsi D