Rajesh, a student got marks-sheet from Haryana Education Board, showing that he had passed in biology, physics and chemistry with good marks. Rajesh, as a matter of fact had never opted or appeared for biology. However, he remained silent and sought admission in 1st year of MBBS course at Guru Nanak Dev Medical College. When he had to appear in his 1st professional course of MBBS, Haryana Board realizing the error, served a notice on him for wrong marks-sheet. Subsequently, the Medical College cancelled his admission. Rajesh consults you for using estoppels against Haryana Board. Give your opinion with reasons.     (10 Marks)