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sum_(j=1)^(3)(3j)=

$\sum_{j=1}^{3}(3 j)=$

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Find derivatives using the chain rule I

Full solution

Q.

\sum_{j=1}^{3}(3 j)=

Calculate first term: The series is an arithmetic series where each term is given by the formula $3j$ . We need to calculate the sum of the first three terms of this series: $3(1) + 3(2) + 3(3)$ .
Calculate second term: Calculate the first term: $3(1) = 3$ .
Calculate third term: Calculate the second term: $3(2) = 6$ .
Calculate sum of series: Calculate the third term: $3(3) = 9$ .
Calculate sum of series: Calculate the third term: $3(3) = 9$ . Add the three terms together to find the sum of the series: $3 + 6 + 9 = 18$ .

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