An electronics retailer list the sales (in thousands) of certain products in three cities for the prior quarter. During that period tablets sold for $220, laptops sold for $346, cell phones sold for $126, and DVR sold for $1,971. City 1 City 2 City 3 Tablets 76 57 53 Laptop Computers 73 52 75 Cell Phones 61 65 50 Personal DVR 66 47 70 City 1's total sales: thousand dollars City 2's total sales: thousand dollars City 3's total sales : thousand dollars

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Q: Find n and sn  If a = 5 , d = 3 , an= 50

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