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27 May, 12:00

Which of the following represents the sum of 3+10 + ... + 87+94 if the arithmetic series has 14 terms

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  1. 27 May, 12:09
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    Here is a trick that not a lot of people know

    (# of terms) * (first+last) / 2

    (in case you don't know, * means multiply and / means divide)
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