Problem: a square was given . inside the square there are white tiles and black tiles . black tiles was among the diagonal of the square and dimensions of both white as well as black tiles is 1 cm x 1 cm . if there are 81 black tiles in the square . then find the no of white tiles in it . 
Options: ['a ) 2399', 'b ) 1600', 'c ) 2679', 'd ) 1697', 'e ) 1711']
b