Mathematics · Averages
In a sequence of 11 numbers a1, a2, ..., a11, it is given that: a1 + a11 = -2 a2 + a10 = 3 a3 + a9 = -7 a4 + a8 = 11 a5 + a7 = -6 a6 = 12 Find the average of a1, a2, ..., a11.
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