JAMB Governament 2018 Paper

Before the Second Ballot System is introduce in an election is when none of the candidates wins the election by absolute majority in a general election, another election would be conducted. In this final election, only the candidates with the highest votes are allowed to contest.

So the second ballot is based on the principle that a successful candidate must obtain Absolute Majority

Absolute Majority System is a system of voting in which a candidate must acquire more than half of the total vote cast before he can be declared winner.