Answer
$y^{2}$
Work Step by Step
$y^{2}$ , $y^{4}$ , $y^{7}$
$y^{2}$= y.y
$y^{4}$ = y.y.y.y
$y^{7}$ = y.y.y.y.y.y.y
GCF = y.y=$y^{2}$
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