Sinnce $$7^{2}=49$$, its ones\textquotesingle{} digit is a $$9$$. What is the ones\textquotesingle{} digit of $$2^{50}$$? 
Overseas Competition->Knowledge Point->Number Theory Modules->Division without Remainders->Applying the Properties of Dividing without Remainders->Maximum/Minimum Problems of Division without Remainders 
The ones\textquotesingle{} digits repeat in groups of four: $$2$$, $$4$$, $$8$$, $$6$$, $$2$$, $$4$$, $$8$$, $$6$$, $$\cdots $$. The ones\textquotesingle{} digits of $$2^{48}$$, $$2^{49}$$, $$2\%{50}$$ are $$6$$, $$2$$, $$4$$. 