Perimeter of square B = 16 cm
Side of Square B = 16/4 = 4 cm
Area of square B = 4^2 = 16 square cm
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If square B is placed within square A, area of square A not covered by square B (shown in black) will be 9 square cm (25-16=9).
If square B is placed within square A and a random point is chosen within square A, the probability that the point is not within square B
= area of A not covered by B/ area of A
Answer is A
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