Mathematics, 25.04.2020 01:01 kitttimothy55

An experiment consists of choosing one card from standard deck then replacing it. The experiment was done several times and the results are:
8 hearts, 8 diamonds, 6 spades, and 6 clubs
Find the experimental probability that a card is red

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Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

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An experiment consists of choosing one card from standard deck then replacing it. The experiment was...