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Rakesh K. Parmar
Department of Mathematics Government College of Engineering and Technology Bikaner-334004 Rajasthan State India
R. K. Raina
Department of Mathematics M.P. University of Agriculture and Technology Udaipur 313002 Rajasthan State, India Present address: 10/11 Ganpati Vihar, Opposite Sector 5, Udaipur- 313002, Rajasthan State, India