Question 1

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En una progressió aritmètica,

 begin mathsize 12px style bold italic a subscript begin bold style 9 end style end subscript bold equals begin bold style negative 67 end style bold space bold space bold italic i bold space bold space bold italic a subscript begin bold style 16 end style end subscript bold space bold equals begin bold style negative 123 end style end style

Calcula begin mathsize 12px style bold a subscript begin bold style 6 end style end subscript end style

 

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