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Rumus suku ke- dari barisan bilangan  adalah ...

Pertanyaan

Rumus suku ke-begin mathsize 14px style n end style dari barisan bilangan begin mathsize 14px style 9 comma space 3 comma space 1 comma space 1 third comma space... end style adalah ...

Pembahasan Soal:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row a equals cell U subscript 1 equals 9 end cell row r equals cell U subscript 2 over U subscript 1 end cell row blank equals cell 3 over 9 end cell row blank equals cell 1 third end cell end table end style 

Sehingga, 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight U subscript straight n end cell equals cell a r to the power of n minus 1 end exponent end cell row blank equals cell 9 times open parentheses 1 third close parentheses to the power of n minus 1 end exponent end cell row blank equals cell 3 squared times open parentheses 3 to the power of negative 1 end exponent close parentheses to the power of n minus 1 end exponent end cell row blank equals cell 3 to the power of 2 minus n plus 1 end exponent end cell row blank equals cell 3 to the power of 3 minus n end exponent end cell row blank equals cell 3 cubed over 3 to the power of n end cell row blank equals cell 27 over 3 to the power of n end cell end table end style 

Jadi, Rumus suku ke-begin mathsize 14px style n end style dari barisan bilangan begin mathsize 14px style 9 comma space 3 comma space 1 comma space 1 third comma space... end style adalah Error converting from MathML to accessible text..

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 10 Juni 2021

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