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Dalam sebuah kantong terdapat 8 kelereng merah dan 4 kelereng putih, jika diambil 3 kelereng sekaligus secara acak, maka peluang terambilnya 2 kelereng merah dan 1 kelereng putih adalah….

Dalam sebuah kantong terdapat 8 kelereng merah dan 4 kelereng putih, jika diambil 3 kelereng sekaligus secara acak, maka peluang terambilnya 2 kelereng merah dan 1 kelereng putih adalah….

  1. 28 over 55

  2. 26 over 55

  3. 24 over 55

  4. 22 over 55

  5. 22 over 55

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S. Difhayanti

Master Teacher

Mahasiswa/Alumni Universitas Muhammadiyah Prof. Dr. Hamka

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Pembahasan

P open parentheses A close parentheses equals fraction numerator n open parentheses A close parentheses over denominator n open parentheses A close parentheses end fraction space space space space space space space space space equals fraction numerator C presubscript 8 subscript 2 cross times C presubscript 4 subscript 1 over denominator C presubscript 12 subscript 3 end fraction space space space space space space space space space equals fraction numerator begin display style fraction numerator 8 factorial over denominator open parentheses 8 minus 2 close parentheses factorial 2 factorial end fraction end style cross times begin display style fraction numerator 4 factorial over denominator open parentheses 4 minus 1 close parentheses factorial 1 factorial end fraction end style over denominator begin display style fraction numerator 12 factorial over denominator open parentheses 12 minus 3 close parentheses factorial 3 factorial end fraction end style end fraction space space space space space space space space space equals space fraction numerator begin display style fraction numerator 8 factorial over denominator 6 factorial 2 factorial end fraction end style cross times begin display style fraction numerator 4 factorial over denominator 3 factorial 1 factorial end fraction end style over denominator begin display style fraction numerator 12 factorial over denominator 9 factorial 3 factorial end fraction end style end fraction space space space space space space space space equals space fraction numerator begin display style fraction numerator 8.7.6 factorial over denominator 6 factorial.2 factorial end fraction end style cross times begin display style fraction numerator 4 factorial over denominator 3 factorial 1 factorial end fraction end style over denominator begin display style fraction numerator 12 factorial over denominator 9 factorial 3 factorial end fraction end style end fraction space space space space space space space space equals space fraction numerator begin display style fraction numerator 8.7.6 factorial over denominator 6 factorial 1.2 end fraction end style cross times begin display style fraction numerator 4.3 factorial over denominator 3 factorial 1 end fraction end style over denominator begin display style fraction numerator 12.11.10.9 factorial over denominator 9 factorial 1.2.3 end fraction end style end fraction space space space space space space space space equals space fraction numerator 28 cross times 4 over denominator 2 cross times 11 cross times 10 end fraction equals 28 over 55

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