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b (beda / loncat) = 1,5
s25 = 1/2 x n {2a + (n - 1) x b}
s25 = 1/2 x 25 {2 x 3 + (25 - 1) x 1,5}
s25 = 12,5 (6 + 24 x 1,5)
s25 = 12,5 (6 + 36)
s25 = 12,5 x 42
s25 = 525