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S25 = 25/2 (2(15) + (25-1)10)
S25 = 25/2 (30) + 240)
S25 = 25/2 (270)
S25 = 25 x 135
S25 = 3375 m
b = 25-15 = 10
u25 = a+ (n-1)b
= 15 + (25-1)10
= 15 + 240
= 255 cm
anak tangga ke 25 = 255cm