$$\left( \Delta \times 2-1 \right)\times 2=2018$$，  $$\Delta \times 2-1=2018\div 2=1009$$，  $$\Delta \times 2=1009+1=1010$$，  $$\Delta =1010\div 2=505$$．  故选$$\text{C}$$． 
若$$\left( \Delta \times 2-1 \right)\times 2=2018$$，请问$$\Delta $$代表的数是． 
Options:
1: $$503$$ 
2: $$504$$ 
3: $$505$$ 
4: $$506$$ 