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

=9/25

Answer is A

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