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u5 = 192
192 = 12 . r(5-1)
192 = 12 . r(4)
r(4) = 192/12
r(4) = 12
r = 2 (akar 4)
sn = 12 [2^5 - 1 ] / [2 - 1]
sn = 12 x 32
sn = 384 cm
a x = 192
12 x = 19
12 x = 192
= 192 : 12
= 16
= 16
r = = 2
Panjang tali mula mula:
12 x (32- 1)
12 x 31
372 cm