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Chessboard and Spider puzzle:
ANSWER:
Sample space:
Sides (5*7*4)*2 = 280 - spider facing both directions
Diagonals (2+4+6+8+6+4+2)*2 = 64
sample space: 344
Event:
Spider landing Only on black: 32 possibilities (through 2 diagonals)
All other combinations will have minimum 4 white spaces
Hence (344-32)/344
= 312/344
=78/86
Answer is 78/86
ANSWER:
Sample space:
Sides (5*7*4)*2 = 280 - spider facing both directions
Diagonals (2+4+6+8+6+4+2)*2 = 64
sample space: 344
Event:
Spider landing Only on black: 32 possibilities (through 2 diagonals)
All other combinations will have minimum 4 white spaces
Hence (344-32)/344
= 312/344
=78/86
Answer is 78/86