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200cm-46cm=154cm
154cm:7cm x 1kursi = 22 kursi
22 kursi + 1 kursi awal = 23kursi
pertambahan tinggi tumpukan =b=7
tinggi tumpukan = un = 200cm
banyak kursi=n
rumusnya :
a+(n-1)b = un
46+(n-1)7 = 200
7n -7 = 154
7n = 161
n=23