$$\left( 1+62 \right)\times 62\div 2=1953$$  $$1953-1940=13$$. 
The page numbers of a book are from $$1$$ to $$62$$. Tim adds up the $$62$$ page numbers. In his calculation, he misses a page number and the sum of remaining pages is $$1940$$. What is the missing page number~\uline{~~~~~~~~~~}~. 
Options:
  $$12$$ 
  $$13$$ 
  $$14$$ 
  $$15$$ 