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If (a+b k)/(a-b k)=(b+c k)/(b-c k)=(c+dk...

If `(a+b k)/(a-b k)=(b+c k)/(b-c k)=(c+dk)/(c-dk)AA k !=0, a , b , c , d >0!=1,`then prove that Ina, Inb, Inc, Ind are in `A.P.`

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