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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Alka gupta Best Answer
this type is not any short trick exist....even qus become more complicated with this method....use this method to find order of an element
at last 15^2=1mod(15) is incorrect, pls verify?
hmm....this is 14...I wrote this 15 by mistake....O(14)=2