If a, b, x, and y are positive integers, and fff$13^a×13^b=(13^x)^y=13^13$/ff...【小站备考】

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If a, b, x, and y are positive integers, and

$13^a×13^b=(13^x)^y=13^13$ , what is the average (arithmetic mean) of a, b, x, and y?
_____

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