$2+(50-1)\times3=149$. 
If I start with $2$, and begin to count by $$3\textquotesingle$$s, my $50^{}\text{th}$ number will be~\uline{~~~~~~~~~~}~. 
Options:
  * $$148$$ 
  * $$149$$ 
  * $$150$$ 
  * $$151$$ 
  * $$152$$ 