Election: single candidate and two or more candidates
Section 179(3) · 1999 Constitution (2004 edition)
What Constitution says
(3) In default of a candidate duly elected in accordance with subsection (2) of this section there shall be a second election in accordance with subsection (4) of this section at which the only candidates shall be - (a) the candidate who secured the highest number of votes cast at the election; and (b) one among the remaining candidates who secured a majority of votes in the highest number of local government areas in the State, so however that where there are more than one candidate with a majority of votes in the highest number of local government areas, the candidate among them with the next highest total of votes cast at the election shall be the second candidate.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 83–84. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections