If \( g(x)=3 a^{x}+7 a^{2} b-13 a b^{2}+9 b^{\gamma} \) is a homogeneous expression in terms of ...

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If \( g(x)=3 a^{x}+7 a^{2} b-13 a b^{2}+9 b^{\gamma} \) is a homogeneous expression in terms of \( a \) and \( b \), then the values of \( x \) and \( y \) respectively are
(a) 2,2
(b) 2,1
(c) 3,2
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