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Buktikan kebenaran setiap deret berikut. c. 2 1 ​ − 4 1 ​ − 8 1 ​ − ... − 2 n 1 ​ = 2 n 1 ​

Buktikan kebenaran setiap deret berikut. 

c.  

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A. Acfreelance

Master Teacher

Mahasiswa/Alumni UIN Walisongo Semarang

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Pembahasan

Pembuktian dengan menggunakan induksi matematika Untuk n = 1 maka Untuk n = k diasumsikan terbukti maka Untuk n = k+1 maka Jadi terbukti karena hasil sisi kanan dan kiri sama

Pembuktian dengan menggunakan induksi matematika

Untuk n = 1 maka

1 half minus 1 fourth minus 1 over 8 minus... negative 1 over 2 to the power of straight n equals 1 over 2 to the power of straight n 1 half minus 1 fourth minus 1 over 8 minus... negative 1 over 2 to the power of 1 equals 1 over 2 to the power of 1 1 half minus 1 fourth minus 1 over 8 minus... negative 1 half equals 1 half rightwards arrow Terbukti space

Untuk n = k diasumsikan terbukti maka

1 half minus 1 fourth minus 1 over 8 minus... negative 1 over 2 to the power of straight n equals 1 over 2 to the power of straight n 1 half minus 1 fourth minus 1 over 8 minus... negative 1 over 2 to the power of k equals 1 over 2 to the power of k rightwards arrow Terbukti space

Untuk n = k+1 maka

table attributes columnalign right center left columnspacing 0px end attributes row cell 1 half minus 1 fourth minus 1 over 8 minus... negative 1 over 2 to the power of straight n end cell equals cell 1 over 2 to the power of straight n end cell row cell 1 half minus 1 fourth minus 1 over 8 minus... negative 1 over 2 to the power of straight k plus 1 over 2 to the power of straight k plus 1 end exponent end cell equals cell 1 over 2 to the power of straight k plus 1 end exponent end cell row cell 1 over 2 to the power of straight k minus 1 over 2 to the power of straight k plus 1 end exponent end cell equals cell 1 over 2 to the power of straight k plus 1 end exponent end cell row cell fraction numerator 2 to the power of 1 minus 1 over denominator 2 to the power of straight k plus 1 end exponent end fraction end cell equals cell 1 over 2 to the power of straight k plus 1 end exponent end cell row cell 1 over 2 to the power of straight k plus 1 end exponent end cell equals cell 1 over 2 to the power of straight k plus 1 end exponent rightwards arrow Terbukti space end cell end table

Jadi terbukti 1 half minus 1 fourth minus 1 over 8 minus... negative 1 over 2 to the power of straight n equals 1 over 2 to the power of straight n karena hasil sisi kanan dan kiri sama

 

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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 ​

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