Rewrite the correct option in your answer sheet. 1. If the demand equation for a certain commodity is Q = a – bP, then the expression for elasticity of demand is a) Qd P/dP dQd b) Qd P/ dQd dP c) P Qd dQd dP d P Qd/ dP dQd​

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

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