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Besar suku ke- dari barisan geometri   adalah …

Pertanyaan

Besar suku ke-undefined dari barisan geometri begin mathsize 14px style 2 comma blank minus 1 half comma blank 1 over 8 comma blank horizontal ellipsis end style  adalah …

  1. begin mathsize 14px style negative 2 to the power of negative 10 end exponent end style 

  2. begin mathsize 14px style negative 2 to the power of negative 9 end exponent end style 

  3. begin mathsize 14px style negative 2 to the power of negative 8 end exponent end style 

  4. begin mathsize 14px style negative 2 to the power of negative 7 end exponent end style 

  5. begin mathsize 14px style negative 2 to the power of negative 6 end exponent end style 

Pembahasan Video:

Pembahasan Soal:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row r equals cell U subscript 2 over U subscript 1 end cell row blank equals cell fraction numerator negative begin display style 1 half end style over denominator 2 end fraction end cell row blank equals cell negative 1 fourth end cell end table end style 

Sehingga,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell U subscript n end cell equals cell a r to the power of n minus 1 end exponent end cell row cell U subscript 6 end cell equals cell 2 times open parentheses negative 1 fourth close parentheses to the power of 6 minus 1 end exponent end cell row blank equals cell 2 times open parentheses negative 1 over 2 squared close parentheses to the power of 5 end cell row blank equals cell negative fraction numerator 2 times 1 to the power of 5 over denominator 2 to the power of 10 end fraction end cell row blank equals cell negative 2 to the power of negative 9 end exponent end cell end table end style 

Jadi, jawaban yang tepat adalah B.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 12 April 2021

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