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n = 5
a = 1,2m
U5 = 2,4m
U5 = a + (5-1)b
2,4 = 1,2 + 4.b
2,4 - 1,2 = 4b
b = 1,2 / 4 = 0,3m
jumlah tali seluruhnya S5
S5 = n/2 [2a + (n-1)b]
= 5/2 [2,4 + 4.0,3]
=5/2 [2,4 + 1,2]
=5/2 [3,6]
=5 . 1,8 = 9m
jumlah tali seluruhnya = 9m