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Pertanyaan

Prove that, if n is positive integer, 5 2 n + 1 2 n − 1 is divisible by 13 .

Prove that, if  is positive integer,  is divisible by .

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N. Puspita

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terbukti bahwa habis dibagi 13.

terbukti bahwa 5 to the power of 2 n end exponent plus 12 to the power of n minus 1 end exponent habis dibagi 13.

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Misalkan habis dibagi 13. Langkah pembuktian Langkah pertama: habis dibagi 13 Langkah kedua: Anggap habis dibagi 13. Akan dibuktikan kebenaran dari pernyataan habis dibagi 13. perhatikan habis dibagi 13 dan juga habis dibagi 13. Maka, habis dibagi 13. Jadi, terbukti bahwa habis dibagi 13.

Misalkan P subscript n identical to 5 to the power of 2 n end exponent plus 12 to the power of n minus 1 end exponenthabis dibagi 13.

Langkah pembuktian

Langkah pertama:

P subscript 1 identical to 5 to the power of 2.1 end exponent plus 12 to the power of 1 minus 1 end exponent equals 25 plus 1 equals 26 equals 2 space. space 13 habis dibagi 13

Langkah kedua:

Anggap P subscript k identical to 5 to the power of 2 k end exponent plus 12 to the power of k minus 1 end exponent  habis dibagi 13. Akan dibuktikan kebenaran dari pernyataan P subscript k plus 1 end subscript identical to 5 to the power of 2 left parenthesis k plus 1 right parenthesis end exponent plus 12 to the power of left parenthesis k plus 1 right parenthesis minus 1 end exponent habis dibagi 13.

5 to the power of 2 left parenthesis k plus 1 right parenthesis end exponent plus 12 to the power of left parenthesis k plus 1 right parenthesis minus 1 end exponent equals 5 to the power of 2 k plus 2 end exponent plus 12 to the power of k space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 5 to the power of 2 k end exponent space. space 5 squared plus 12 to the power of k space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 5 to the power of 2 k end exponent space. space 25 plus 12 to the power of k space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 12 space. space 5 to the power of 2 k end exponent plus space 13 space. space 5 to the power of 2 k end exponent plus 12 to the power of k space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 12 space. space 5 to the power of 2 k end exponent plus 12 to the power of k plus space 13 space. space 5 to the power of 2 k end exponent space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 12 open parentheses 5 to the power of 2 k end exponent plus 12 to the power of k over 12 close parentheses plus space 13 space. space 5 to the power of 2 k end exponent space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 12 open parentheses 5 to the power of 2 k end exponent plus 12 to the power of k minus 1 end exponent close parentheses plus space 13 space. space 5 to the power of 2 k end exponent 

perhatikan open parentheses 5 to the power of 2 k end exponent plus 12 to the power of k minus 1 end exponent close parentheses habis dibagi 13 dan 13 space. space 5 to the power of 2 k end exponent juga habis dibagi 13. Maka, P subscript k plus 1 end subscript identical to 5 to the power of 2 left parenthesis k plus 1 right parenthesis end exponent plus 12 to the power of left parenthesis k plus 1 right parenthesis minus 1 end exponent habis dibagi 13. 

Jadi, terbukti bahwa 5 to the power of 2 n end exponent plus 12 to the power of n minus 1 end exponent habis dibagi 13.

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