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Let a ,x, y ,z b be in AP where x+y+z=15...

Let a ,x, y ,z b be in AP where x+y+z=15 Let a ,p,q ,r ,b be in HP where `p^(-1) +q^(-1)+r^(-1)=5/3` What is the value of ab What is the value of xyz What is the value of pqr

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