Respuesta :

[tex]\Sigma^6_{j=1}9j\text{ = 9}\cdot1\text{ + 9}\cdot2\text{ +9}\cdot3\text{ +9}\cdot4\text{ + 9}\cdot5\text{ + 9}\cdot6\text{ = 189}[/tex]

Another way of solving this is the following:

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