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16 December, 23:51

3+1 + - + ... ?

What is the sum of the first 7 terms of this geometric series: 3+1 + 3

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  1. 17 December, 00:14
    0
    15

    Step-by-step explanation:

    3+1+3+1+3+1+3 = 15 this is what it would look like if you write it out. To save time do 3 times 4 to get 12 and then just add three ones to 12 to get 15.
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