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This problem trains for: SAT-I.

A coin is dropped at random within this contour:

figure

Ignore the fact that the coin has dimensions.

What is the probability for the coin to land 'head' on black?

The event 'land head on black' is a compound event formed by two elementary independent events:

The probability of the event is the product of the probabilities of the two independent events:

equation

equation

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