Notice of the adoption of the resolution and of the time and place of holding the meeting shall be given by posting copies of the resolution signed by the board or by a majority thereof in three public places in the district, not less than 15 days before the date of the meeting, and by publishing the notice not less than once a week for three successive weeks before the meeting in a newspaper of general circulation published in the county in which the district or any part thereof is situated, if any such newspaper is published therein.