A floor is paved with rectangular bricks, each of \( \mathrm{P} \) ...

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A floor is paved with rectangular bricks, each of
\( \mathrm{P} \) length a and breadth \( \mathrm{b} \). A circular disc of diameter

W \( \mathrm{c} \) is thrown on the floor. The chance that it falls entirely on one bricks is
(1) \( \frac{c}{a b} \)
(2) \( \frac{c}{\sqrt{a b}} \)
(3) \( \frac{(a-c)(b-c)}{c^{2}} \)
(4) \( \frac{(a-c)(b-c)}{a b} \)
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