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The total area of the board = 30*30 = 900 square inches
The area of the shaded region = 10*10 = 100 square inches
The probability of not landing in the shaded region is the ratio of the unshaded
area to the total area
The unshaded area = 900 - 100 = 800 square inches
Therefore, the probability is:
P(unshaded) = 800/900 = 8/9 = 0.8889