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Tiga keping uang logam dilempar bersama. Misalkan A kejadian muncul sekurang-kurangnya dua sisi gambar dan B kejadian muncul sisi gambar pada uang logam pertama. Tentukan: a. P ( A ∣ B ) b. P ( B ∣ A )

Tiga keping uang logam dilempar bersama. Misalkan A kejadian muncul sekurang-kurangnya dua sisi gambar dan B kejadian muncul sisi gambar pada uang logam pertama. Tentukan:

a. 

b. 

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W. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sriwijaya

Jawaban terverifikasi

Jawaban

.

 straight P left parenthesis straight B vertical line straight A right parenthesis equals 1 half.

Pembahasan

Diketahui: Ditanya: a. Jadi, . b. Jadi, .

Diketahui:

A equals open curly brackets A G G comma G A G comma G G A comma space G G G close curly brackets B equals open curly brackets G A A comma G G A comma space G G G close curly brackets n left parenthesis A right parenthesis equals 4 n left parenthesis B right parenthesis equals 3 n left parenthesis S right parenthesis equals 8 n left parenthesis A intersection B right parenthesis equals 2

Ditanya: 

a. straight P left parenthesis straight A vertical line straight B right parenthesis

table attributes columnalign right center left columnspacing 0px end attributes row cell straight P left parenthesis straight A vertical line straight B right parenthesis end cell equals cell fraction numerator straight P left parenthesis straight A intersection straight B right parenthesis over denominator straight P left parenthesis straight B right parenthesis end fraction end cell row blank equals cell fraction numerator begin display style fraction numerator straight n left parenthesis straight A intersection straight B right parenthesis over denominator straight n left parenthesis straight S right parenthesis end fraction end style over denominator begin display style fraction numerator straight n left parenthesis straight B right parenthesis over denominator straight n left parenthesis straight S right parenthesis end fraction end style end fraction end cell row blank equals cell fraction numerator begin display style 2 over 8 end style over denominator begin display style 3 over 8 end style end fraction end cell row blank equals cell 2 over 3 end cell end table

Jadi, straight P left parenthesis straight A vertical line straight B right parenthesis equals 2 over 3.

b. straight P left parenthesis straight B vertical line straight A right parenthesis

table attributes columnalign right center left columnspacing 0px end attributes row cell straight P left parenthesis straight B vertical line straight A right parenthesis end cell equals cell fraction numerator straight P left parenthesis straight A intersection straight B right parenthesis over denominator straight P left parenthesis straight A right parenthesis end fraction end cell row blank equals cell fraction numerator begin display style fraction numerator straight n left parenthesis straight A intersection straight B right parenthesis over denominator straight n left parenthesis straight S right parenthesis end fraction end style over denominator begin display style fraction numerator straight n left parenthesis straight A right parenthesis over denominator straight n left parenthesis straight S right parenthesis end fraction end style end fraction end cell row blank equals cell fraction numerator begin display style 2 over 8 end style over denominator begin display style 4 over 8 end style end fraction end cell row blank equals cell 1 half end cell end table

Jadi, straight P left parenthesis straight B vertical line straight A right parenthesis equals 1 half.

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