How the President of India is elected?

[abhisays]

Elimination of the Bottom Candidate

If all the seats are filled upon this second count, the election is completed. But if all the required number of candidates do not reach the quota by the distribution of surplus first preferences votes of the candidates who have received more than the quota, the process is reversed by dropping out the candidate who has the least number of first preferences. The whole of his votes are transferred to the other not yet elected candidates in accordance with the next available preferences shown on his papers (next available means next excluding candidates already elected). If this does not suffice to fill the remaining seat or seats, the process is repeated by the exclusion of the candidate now at the bottom of polls and the transfer of his votes as a whole in accordance with the next available preferences shown on his papers. Eventually in this way all seats are filled.
Irrespective of the fact that a number of seats may have to be filled, this system postulates one vote for each voter with the reservation that this single vote is transferred to other candidates. This is the reason why this system is known as "single transferable vote system."
The question of proportional representation in one sense can arise only in a multiple-member constituency when there are several seats to be filled up. In that case, the surplus votes are transferred to or distributed amongst the different candidates in order to get the number of members required to be elected, according to the procedure indicated above. Under the Constitution of India members of the Upper House of Parliament and of the State Legislature are elected according to the above formula.