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Sebuah uang logam diundi 8 kali. Peluang diperoleh sisi angka (A) sebanyak 4 sampai 6 kali adalah ...

Sebuah uang logam diundi 8 kali. Peluang diperoleh sisi angka (A) sebanyak 4 sampai 6 kali adalah ...

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E. Dwi

Master Teacher

Mahasiswa/Alumni Universitas Sriwijaya

Jawaban terverifikasi

Jawaban

peluang diperoleh sisi angka (A) sebanyak 4 sampai 6 kali adalah .

peluang diperoleh sisi angka (A) sebanyak 4 sampai 6 kali adalah begin mathsize 14px style 47 over 128 end style.

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Pembahasan

Jadi, peluang diperoleh sisi angka (A) sebanyak 4 sampai 6 kali adalah .

begin mathsize 14px style n left parenthesis S right parenthesis equals 2 to the power of 8 equals 256 K equals open curly brackets G to the power of 4 A to the power of 4 comma space G cubed A to the power of 5 comma space G squared A to the power of 6 close curly brackets end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell C presubscript n subscript r end cell equals cell fraction numerator n factorial over denominator r factorial left parenthesis n minus r right parenthesis factorial end fraction end cell row cell C presubscript 8 subscript 4 end cell equals cell fraction numerator 8 factorial over denominator 4 factorial left parenthesis 8 minus 4 right parenthesis factorial end fraction end cell row cell C presubscript 8 subscript 4 end cell equals cell fraction numerator 8 cross times 7 cross times 6 cross times 5 cross times 4 factorial over denominator 4 factorial cross times 4 cross times 3 cross times 2 cross times 1 end fraction end cell row cell C presubscript 8 subscript 4 end cell equals cell 20 over 2 end cell row cell C presubscript 8 subscript 4 end cell equals 10 row cell C presubscript 8 subscript 5 end cell equals cell fraction numerator 8 factorial over denominator 5 factorial left parenthesis 8 minus 5 right parenthesis factorial end fraction end cell row cell C presubscript 8 subscript 5 end cell equals cell fraction numerator 8 cross times 7 cross times 6 cross times 5 factorial over denominator 5 factorial cross times 3 factorial end fraction end cell row cell C presubscript 8 subscript 5 end cell equals cell 112 over 2 end cell row cell C presubscript 8 subscript 5 end cell equals 56 row cell C presubscript 8 subscript 6 end cell equals cell fraction numerator 8 factorial over denominator 6 factorial left parenthesis 8 minus 6 right parenthesis factorial end fraction end cell row cell C presubscript 8 subscript 6 end cell equals cell fraction numerator 8 cross times 7 cross times 6 factorial over denominator 6 factorial cross times 2 factorial end fraction end cell row cell C presubscript 8 subscript 6 end cell equals cell 56 over 2 end cell row cell C presubscript 8 subscript 6 end cell equals 28 row cell n left parenthesis K right parenthesis end cell equals cell 10 plus 56 plus 28 equals 94 end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell P left parenthesis K right parenthesis end cell equals cell fraction numerator n left parenthesis K right parenthesis over denominator n left parenthesis S right parenthesis end fraction end cell row blank equals cell 94 over 256 equals 47 over 128 end cell end table end style 

Jadi, peluang diperoleh sisi angka (A) sebanyak 4 sampai 6 kali adalah begin mathsize 14px style 47 over 128 end style.

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