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Pakai rumus barisan aritmatika
a = 15
b = 18 - 15 = 3
a + (n - 1) b = un
15 + ( 50 -1) 3 = u50
15 + (49) 3 = u50
15 + 147 = 162
jadi tinggi tumpukan 50 gelas = 162cm