Union Government
(1) As far as practicable, there shall be uniformity in the scale of representation of the different States at the election of the President. (2) The number of votes which each elected member of Parliament and of the Legislative Assembly of each State is entitled to cast is determined by a formula based on the State's population divided by its number of elected Assembly members, designed to give parity between the States as a whole and the Union. (3) The election of the President shall be held in accordance with the system of proportional representation by means of the single transferable vote and the voting at such election shall be by secret ballot.
This sets out the technical formula for weighting votes in the presidential election, so that MLAs from larger states carry proportionally more voting weight than MLAs from smaller states, while keeping overall balance between the States and Parliament. Voting uses a secret-ballot, single-transferable-vote system.
An MLA from a large state like Uttar Pradesh carries a higher vote-value in a presidential election than an MLA from a small state like Sikkim, because the formula accounts for each state's population relative to its assembly size - this keeps the election roughly proportional to population, not just "one legislator, one vote".