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= 6n = 56
dit = 25n ?
jawab = b = 6n - 3n = 56 - 38 / 6 - 3 = 18/3 = 6
u3, u2, u1
38, 32, 26
a = 26
s25 = 2 x a (n-1) b
= 2 x 26 (25-1) 6
= 52 (24 x 6)
= 52 (144)
= 52 x 144
s25 = 7.488