Jasiek ma w skarbonce 8 monet po 5zł i 10 monet po 2 zł. Wyjmujemy losowo 5 monet. Oblicz prawdopodobieństwo, ze wyjmie conajmniej 4 monety po 2 zł.
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(8/18 * 10/18 * 10/18 * 10/18 * 10/18) + (10/18 * 8/18 * 10/18 * 10/18 * 10/18) + (10/18 * 10/18 * 8/18 * 10/18 * 10/18) + (10/18 * 10/18 * 10/18 * 8/18 * 10/18) + (10/18 * 10/18 * 10/18 * 10/18 * 8/18) + (10/18 * 10/18 * 10/18 * 10/18 * 10/18) = 2500/59049 + 2500/59049 + 2500/59049 + 2500/59049 + 2500/59049 + 3125/59049 = 15625/59049 = 0.26 = 26%