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Dalam sebuah keranjang terdapat 30 jeruk dan 20 salak. Jika diambil 5 buah secara acak, maka peluang diperoleh paling tidak 2 jeruk adalah ...

Dalam sebuah keranjang terdapat 30 jeruk dan 20 salak. Jika diambil 5 buah secara acak, maka peluang diperoleh paling tidak 2 jeruk adalah ...

  1. begin mathsize 14px style 1 minus fraction numerator straight C subscript 1 superscript 30 straight space straight C subscript 4 superscript 20 over denominator straight C subscript 5 superscript 50 end fraction end style

  2. begin mathsize 14px style 1 minus fraction numerator straight C subscript 1 superscript 30 straight space straight C subscript 1 superscript 20 over denominator straight C subscript 5 superscript 50 end fraction end style

  3. begin mathsize 14px style 1 minus fraction numerator straight C subscript 2 superscript 30 straight space straight C subscript 3 superscript 20 over denominator straight C subscript 5 superscript 50 end fraction end style

  4. begin mathsize 14px style 1 minus fraction numerator straight C subscript 3 superscript 30 straight space straight C subscript 2 superscript 20 over denominator straight C subscript 5 superscript 50 end fraction end style

  5. begin mathsize 14px style 1 minus fraction numerator straight C subscript 1 superscript 30 straight space over denominator straight C subscript 5 superscript 50 end fraction end style

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Pembahasan

Syarat : diambil 5, minimal 2 jeruk Peluang 2 jeruk dan 3 salak : Peluang 3 jeruk dan 2 salak : Peluang 4 jeruk dan 1 salak : Peluang 5 jeruk dan 0 salak : Peluang keseluruhan : P = P =

Syarat : diambil 5, minimal 2 jeruk

 

 

begin mathsize 14px style straight C subscript straight space straight r end subscript superscript straight n equals fraction numerator straight n factorial over denominator open parentheses straight n minus straight r close parentheses factorial open parentheses straight r close parentheses factorial end fraction end style

Peluang 2 jeruk dan 3 salak :

begin mathsize 14px style fraction numerator straight C subscript straight space 2 end subscript superscript 30 cross times straight C subscript straight space 3 end subscript superscript 20 over denominator straight C subscript straight space 5 end subscript superscript 50 end fraction end style

Peluang 3 jeruk dan 2 salak :

begin mathsize 14px style fraction numerator straight C subscript straight space 3 end subscript superscript 30 cross times straight C subscript straight space 2 end subscript superscript 20 over denominator straight C subscript straight space 5 end subscript superscript 50 end fraction end style

Peluang 4 jeruk dan 1 salak :

begin mathsize 14px style fraction numerator straight C subscript straight space 4 end subscript superscript 30 cross times straight C subscript straight space 1 end subscript superscript 20 over denominator straight C subscript straight space 5 end subscript superscript 50 end fraction end style

Peluang 5 jeruk dan 0 salak :

begin mathsize 14px style fraction numerator straight C subscript straight space 5 end subscript superscript 30 cross times straight C subscript straight space 0 end subscript superscript 20 over denominator straight C subscript straight space 5 end subscript superscript 50 end fraction end style

Peluang keseluruhan :

P = begin mathsize 14px style fraction numerator straight C subscript straight space 2 end subscript superscript 30 cross times straight C subscript straight space 3 end subscript superscript 20 over denominator straight C subscript straight space 5 end subscript superscript 50 end fraction cross times fraction numerator straight C subscript straight space 3 end subscript superscript 30 cross times straight C subscript straight space 2 end subscript superscript 20 over denominator straight C subscript straight space 5 end subscript superscript 50 end fraction cross times fraction numerator straight C subscript straight space 4 end subscript superscript 30 cross times straight C subscript straight space 1 end subscript superscript 20 over denominator straight C subscript straight space 5 end subscript superscript 50 end fraction cross times fraction numerator straight C subscript straight space 5 end subscript superscript 30 cross times straight C subscript straight space 0 end subscript superscript 20 over denominator straight C subscript straight space 5 end subscript superscript 50 end fraction end style

P = begin mathsize 14px style 1 minus fraction numerator straight C subscript straight space 1 end subscript superscript 30 cross times straight C subscript straight space 4 end subscript superscript 20 over denominator straight C subscript straight space 5 end subscript superscript 50 end fraction end style

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