The mathematics used by illiterate shopkeeper-

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[CTET Dec 2018 Paper 1(Hindi - I, English - II),CTET Dec 2018 Paper 1(English - I, Hindi - II)]

A is very useful in solving all mathematical problems

B has ambiguity and very low level of correctness in it

C should be discussed by the teachers in classrooms as an alternate strategy in solving related problems

D is not useful in the mathematics classroom