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Which book is this
The answer should be either 'b' or 'd'. Insufficient data because they should mention something about 'r' ( atleast like r>0 or r is not equal to zero or p,q,r belong to natural no.s ) And, if we assume it is not equal to 0 then 'b' is the correct option
Academic discussion and doubt solving for: Progression & Series, Inequalities, Linear Equation, Functions, Modulus, Minima & Maxima, Polynomials, Identities, Indices
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there's a small typo. It should be e/q. The answer will be same regardless