Discussion

Explanation:

Maximum number of safe cells will be when the mine is placed at one of the corners.

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If mine is placed at A8, cells marked with × denote unsafe cells.

∴ Number of unsafe cells = 22

∴ Number of safe cells = 64 – 22 = 42.

Minimum number of safe cells will be when the mine is placed in the middle.

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If mine is placed at D4, cells marked with × denote unsafe cells.

∴ Number of unsafe cells = 28

∴ Number of safe cells = 64 – 28 = 36.

⇒ Difference between maximum and minimum safe cells = 42 – 36 = 6.

Hence, option (b).

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