2 corner most boxes of a chess board(diagonally opposite) haven been cut out
there's a rectangular block = 2 sqaures of chess board , how many such blocks can be placed on the chess board ?”	Pick one
A) 27 B) 28 C) 29 D) 30 E) 31
chess board has 64 squares.so we can place 32 rectangular blocks,but 2 are cut off from the corner.   hence 32-2= 
<gadget id="calculator">32-2</gadget>
<output>30</output>
30 blocks   ANSWER:30
<result>D</result>
2 corner most boxes of a chess board(diagonally opposite) haven been cut out
there's a rectangular block = 2 sqaures of chess board , how many such blocks can be placed on the chess board ?”