(b) Any person whose addition to a board as a lay member under the provisions of this section results in the addition of an odd number of lay additions to the board shall serve for a term ending in an odd-numbered year on the date in that year on which terms of the professional members expire. Of the members first appointed, each shall serve for a term ending in the year one thousand nine hundred seventy-nine, and the successor to each of the first members shall serve for a term equal in length to the terms of the other professional members of the board.
(c) Any person whose addition to a board as a lay member under the provisions of this section results in the addition of an even number of lay additions to the board shall serve for a term ending in an even-numbered year on the date in that year on which terms of the professional members expire. Of the members first appointed, each shall serve for a term ending in the year one thousand nine hundred seventy-eight, and the successor to each of the first members shall serve for a term equal in length to the terms of the other professional members of the board.