Average of a, b, and c is 11; average of c, d and e is 17; average of e and f is 22 and average of e and c is 17. Find out the average of a, b, c, d, e and f.
\(15\frac{2}{3}\)
\(18\frac{1}{2}\)
\(16\frac{1}{2}\)
None of these
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