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:

1
\(15 \frac{2}{3}\)
2
\(18 \frac{1}{2}\)
3
\(16 \frac{1}{2}\)
4
None of these

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