S.S. Nijjar, J. - In December 1988, respondent No. 2 issued an advertisement inviting applications for allotment of residential plots measuring 400, 250, 150 and 100 Square Yards in Shri Guru Teg Bahadur Nagar Development Scheme (Water Works Road), at Khanna, District Ludhiana. The number of plots were not advertised. In the advertisement, it was stated that the allotment would be through law of lots. The allotment will be made strictly according to Punjab Town Improvement (Utilisation of Land and Allotment of Plots) Rules, 1983 as amended up-to-date (hereinafter referred to as "the Rules"). It was also provided that reservation in the categories of Schedule Castes, Backward Classes and other categories would be as per government instructions. Pursuant to the aforesaid advertisement, petitioners No. 1 to 4 applied for a 400 square yards plot and deposited Rs. 8000/- with the Improvement Trust Khanna (hereinafter referred to as "the Trust"). Petitioner No. 5 applied for a 250 square yards plot and deposited Rs. 5000/- with the trust. Although the number of vacant plots/sites were not mentioned in the advertisement, on enquiry it revealed to the petitioners that there were 17