20) In a 3 × 3 square grid comprising 9 tiles, each tile can be painted in red/blue colour. When the tile is rotated by 1800, there is no diff which can be spotted. How many such possibilities are there

• let the gried
  1 2 3
  4 5 6
  7 8 9
  now 123 can be painted in
  2*2*2=8 ways
  we have to paint 789 in revers order in which 123 painted
  to make same when we rotate it
  no still total way=8
  now come to 456
  4 and 5 shoul have same color so that when it rotated will look same
  so ther are possibilties BRB or RBR or RRR or BBB
  do total 4 ways
  now total ways to paint the gried = 8*4=32 ans
• 12 years agoHelpfull: Yes(14) No(1)
• answer is 32..
• 12 years agoHelpfull: Yes(7) No(3)
• pls explain
• 12 years agoHelpfull: Yes(3) No(2)
• ...ans is 64
• 12 years agoHelpfull: Yes(2) No(9)