they are the same cars!! its just the x stands for the roman numeral 10.
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Since 0 cannot be in the first place of the 4-digits number, we have 9 x 10 x 10 x 10 = 9,000 combinations.
10 x 10 = 100 5 x 20 = 100 4 x 25 = 100 2 x 50 = 100
210 x 10 = 2100 220 x 10 = 2200 230 x 10 = 2300 240 x 10 = 2400 250 x 10 = 2500
The number of possibilities is 9 x 10 x 10 x 10 x 10 x 10 x 9 = 8,100,000.
(X/3) - 11 =10 X/3 = 21 X = 63