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Pertanyaan

Nilai dari n = 1 ∑ 8 ​ ( 3 n − 2 ) adalah ....

Nilai dari  adalah ....

  1. 86

  2. 88

  3. 90

  4. 92

  5. 94

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R. RGFLSATU

Master Teacher

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Pembahasan

sum from n equals 1 to 8 of left parenthesis 3 n minus 2 right parenthesis equals sum from n equals 1 to 8 of 3 n minus sum from n equals 1 to 8 of 2 equals open square brackets 3 left parenthesis 1 right parenthesis plus 3 left parenthesis 2 right parenthesis plus... plus 3 left parenthesis 8 right parenthesis close square brackets minus open square brackets 2 plus 2 plus... plus 2 close square brackets equals open square brackets 3 left parenthesis 1 plus 2 plus... plus 8 right parenthesis close square brackets minus open square brackets 8 left parenthesis 2 right parenthesis close square brackets equals 3 open square brackets 8 over 2 left parenthesis 1 plus 8 right parenthesis close square brackets minus 16 equals 3 open square brackets 4 left parenthesis 9 right parenthesis close square brackets minus 16 equals 92

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