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Pertanyaan

Dua dadu berwarna merah dan biru dilempar bersama. Misalkan A kejadian muncul jumlah kedua mata dadu 9, B kejadian muncul jumlah kedua mata dadu 3, dan C kejadian muncul selisih kedua mata dadu 1. Tentukan: a. P ( A ∣ B ) b. P ( A ∣ C ) c. P ( C ∣ B )

Dua dadu berwarna merah dan biru dilempar bersama. Misalkan A kejadian muncul jumlah kedua mata dadu 9, B kejadian muncul jumlah kedua mata dadu 3, dan C kejadian muncul selisih kedua mata dadu 1. Tentukan:

a. 

b. 

c. 

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Jawaban terverifikasi

Jawaban

.

 straight P left parenthesis straight C vertical line straight B right parenthesis equals 1.

Pembahasan

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

Diketahui: 

begin mathsize 12px style A equals open curly brackets open parentheses 3 comma 6 close parentheses comma open parentheses 4 comma 5 close parentheses comma open parentheses 5 comma 4 close parentheses comma open parentheses 6 comma 3 close parentheses close curly brackets B equals open curly brackets open parentheses 1 comma 2 close parentheses comma open parentheses 2 comma 1 close parentheses close curly brackets C equals open curly brackets open parentheses 1 comma 2 close parentheses comma open parentheses 2 comma 1 close parentheses comma open parentheses 2 comma 3 close parentheses comma open parentheses 3 comma 2 close parentheses comma open parentheses 3 comma 4 close parentheses comma open parentheses 4 comma 3 close parentheses comma open parentheses 4 comma 5 close parentheses comma open parentheses 5 comma 4 close parentheses comma open parentheses 5 comma 6 close parentheses comma open parentheses 6 comma 5 close parentheses close curly brackets end style

straight n left parenthesis A right parenthesis equals 4 space semicolon space straight n left parenthesis B right parenthesis equals 2 comma space straight n left parenthesis C right parenthesis equals 10 comma space straight n left parenthesis S right parenthesis equals 36

straight n left parenthesis A intersection B right parenthesis equals 0 comma space n left parenthesis A intersection C right parenthesis equals 2 comma space straight n open parentheses C intersection B close parentheses equals 2

Ditanya:

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

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

c. straight P left parenthesis straight C vertical line straight B right parenthesis

Jawab:

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 0 over 36 end style over denominator begin display style 2 over 36 end style end fraction end cell row blank equals 0 end table

Jadi, straight P left parenthesis straight A vertical line straight B right parenthesis equals 0.

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

table attributes columnalign right center left columnspacing 0px end attributes row cell straight P left parenthesis straight A vertical line straight C right parenthesis end cell equals cell fraction numerator straight P left parenthesis straight A intersection straight C right parenthesis over denominator straight P left parenthesis straight C 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 C 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 C 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 36 end style over denominator begin display style 10 over 36 end style end fraction end cell row blank equals cell 1 fifth end cell end table

Jadi, straight P left parenthesis straight A vertical line straight C right parenthesis equals 1 fifth.

c. straight P left parenthesis straight C vertical line straight B right parenthesis

table attributes columnalign right center left columnspacing 0px end attributes row cell straight P left parenthesis straight C vertical line straight B right parenthesis end cell equals cell fraction numerator straight n left parenthesis straight C intersection straight B right parenthesis over denominator straight n 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 C 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 36 end style over denominator begin display style 2 over 36 end style end fraction end cell row blank equals 1 end table

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

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