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Gunakan prinsip induksi matematika untuk membuktikan setiap notasi sigma berikut. a. k = 1 ∑ n ​ k 2 + k 1 ​ = n + 1 n ​

Gunakan prinsip induksi matematika untuk membuktikan setiap notasi sigma berikut.

a. 

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A. Acfreelance

Master Teacher

Mahasiswa/Alumni UIN Walisongo Semarang

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terbukti bahwa hasil sisi kanan dan kiri sama

terbukti bahwa sum from straight k equals 1 to straight n of fraction numerator 1 over denominator straight k squared plus straight k end fraction equals fraction numerator straight n over denominator straight n plus 1 end fraction hasil sisi kanan dan kiri sama

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Pembahasan

Pembuktian dengan induksi matematika dimana Untuk n = 1 Untuk n = k diasumsikan benar maka Untuk n = k+1 akan dibuktikan Jadi terbukti bahwa hasil sisi kanan dan kiri sama

Pembuktian dengan induksi matematika dimana

Untuk n = 1

table attributes columnalign right center left columnspacing 0px end attributes row cell sum from straight k equals 1 to straight n of fraction numerator 1 over denominator straight k squared plus straight k end fraction end cell equals cell fraction numerator straight n over denominator straight n plus 1 end fraction end cell row cell sum from straight k equals 1 to 1 of fraction numerator 1 over denominator 1 squared plus 1 end fraction end cell equals cell fraction numerator 1 over denominator 1 plus 1 end fraction end cell row cell 1 half end cell equals cell 1 half rightwards arrow Terbukti space end cell end table

Untuk n = k diasumsikan benar maka

table attributes columnalign right center left columnspacing 0px end attributes row cell sum from straight k equals 1 to straight n of fraction numerator 1 over denominator straight k squared plus straight k end fraction end cell equals cell fraction numerator straight n over denominator straight n plus 1 end fraction end cell row cell sum from straight k equals 1 to straight k of fraction numerator 1 over denominator straight k left parenthesis straight k plus 1 right parenthesis end fraction end cell equals cell fraction numerator straight k over denominator straight k plus 1 end fraction rightwards arrow Terbukti space end cell end table

Untuk n = k+1 akan dibuktikan

table attributes columnalign right center left columnspacing 0px end attributes row cell sum from straight k equals 1 to straight n of fraction numerator 1 over denominator straight k squared plus straight k end fraction end cell equals cell fraction numerator straight n over denominator straight n plus 1 end fraction end cell row cell sum from straight k equals 1 to straight k plus 1 of fraction numerator 1 over denominator straight k left parenthesis straight k plus 1 right parenthesis end fraction end cell equals cell sum from straight k equals 1 to straight k of fraction numerator 1 over denominator straight k squared plus straight k end fraction plus sum from straight k equals straight k plus 1 to straight k plus 1 of fraction numerator 1 over denominator straight k squared plus straight k end fraction end cell row cell fraction numerator straight k plus 1 over denominator straight k plus 1 plus 1 end fraction end cell equals cell fraction numerator straight k over denominator straight k plus 1 end fraction plus fraction numerator 1 over denominator open parentheses straight k plus 1 close parentheses open parentheses straight k plus 2 close parentheses end fraction end cell row cell fraction numerator straight k plus 1 over denominator straight k plus 2 end fraction end cell equals cell fraction numerator straight k left parenthesis straight k plus 2 right parenthesis over denominator left parenthesis straight k plus 1 right parenthesis left parenthesis straight k plus 2 right parenthesis end fraction plus fraction numerator 1 over denominator open parentheses straight k plus 1 close parentheses open parentheses straight k plus 2 close parentheses end fraction end cell row cell fraction numerator straight k plus 1 over denominator straight k plus 2 end fraction end cell equals cell fraction numerator left parenthesis straight k plus 1 right parenthesis left parenthesis straight k plus 1 right parenthesis over denominator left parenthesis straight k plus 1 right parenthesis left parenthesis straight k plus 2 right parenthesis end fraction end cell row cell fraction numerator straight k plus 1 over denominator straight k plus 2 end fraction end cell equals cell fraction numerator straight k plus 1 over denominator straight k plus 2 end fraction rightwards arrow Terbukti space end cell end table

Jadi terbukti bahwa sum from straight k equals 1 to straight n of fraction numerator 1 over denominator straight k squared plus straight k end fraction equals fraction numerator straight n over denominator straight n plus 1 end fraction hasil sisi kanan dan kiri sama

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