In a 8 x 8 chess board what is the total number of squares.	Pick one:
A) 238 B) 204 C) 678 D) 169 E) 161

Rationale: ans : the total number of squares in a n x n chess board is equal to ` ` the sum of first n natural number squares ' ' i . e . , n ( n + 1 ) ( 2 n + 1 ) 6 n ( n + 1 ) ( 2 n + 1 ) 6 so substituting 8 in the above formula we get 204 answer : b
Answer: B