69. A positional numeral system use 'X' as its radix. In this system, number 252 equals decimal number 209 as following equation: 252(x) = 209(10).What is the value of 'X'?
(A) 6
(B) 7
(C) 8
(D) 9
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統計: A(9), B(16), C(8), D(110), E(0) #2320356
統計: A(9), B(16), C(8), D(110), E(0) #2320356