Section 183(1)(b) in The Rajasthan District Boards Act, 1954
(b)if such person is not found, then by leaving the notice or bill at his last known place of abode if within the jurisdiction of the Board or by giving or tendering the notice or bill to some adult male member or servant of his family, or by causing the notice or bill to be fixed on some conspicuous part of the building or land (if any) to which the notice or bill relates.