What are the election procedures and rules concerning the office of the President and Vice-President in India?
The election procedures and rules concerning the office of the President and Vice-President in India are as follows:

1. Manner of election of President: The President is elected by an electoral college consisting of elected members of both Houses of Parliament, and elected members of the Legislative Assemblies of the States, including National Capital Territory of Delhi and the Union Territory of Puducherry. The election is conducted through a system of proportional representation using the single transferable vote method.

2. Term of office of President: The President holds office for a term of five years from the date on which he enters upon his office. He is eligible for re-election to that office, provided he resigns or completes his current term before being elected again.

3. Qualifications for election as President: A person must be a citizen of India and at least 35 years old to be eligible for election as President. Additionally, they should not hold any office of profit under the Union government or any state government, except for serving as a member of Parliament or State Legislature without receiving any salary or allowance.

4. Conditions of President's office: The President cannot be a member of either House of Parliament or State Legislature and must vacate their seat if elected to the presidency. They are also barred from holding any other office of profit during their term in office.

5. Oath or affirmation by the President: Before entering upon their office, the President must make and subscribe before some person authorized by law an oath or affirmation. The text of this oath is set forth in Article 60 of the Constitution.

6. Procedure for impeachment of the President: The President can be removed from office by a process of impeachment for violating the Constitution. The process involves passing a resolution in either House of Parliament, supported by at least two-thirds majority, followed by a trial conducted by the Chief Justice of India or another judge designated by him/her.

7. Time of holding election to fill vacancy in the office of President and the term of office of person elected to fill casual vacancy: In case of a vacancy in the office of the President due to death, resignation, removal from office, or otherwise, an election must be held within six months from the date of the occurrence of the vacancy. The person elected to fill such a casual vacancy shall hold office for the remainder of the term of the predecessor.

8. Election of Vice-President: The Vice-President is elected by members of an electoral college consisting of members of both Houses of Parliament, in accordance with the system of proportional representation by means of a single transferable vote.

9. Term of office of Vice-President: The Vice-President holds office for a term of five years from the date on which he enters upon his office. They are eligible for re-election to that office.

10. Time of holding election to fill vacancy in the office of Vice-President and the term of office of person elected to fill casual vacancy: In case of a vacancy in the office of the Vice-President due to death, resignation, removal from office, or otherwise, an election must be held within six months from the date of the occurrence of the vacancy. The person elected to fill such a casual vacancy shall hold office for the remainder of the term of the predecessor.

11. Oath or affirmation by the Vice-President: Before entering upon their office, the Vice-President must make and subscribe before some person authorized by law an oath or affirmation. The text of this oath is set forth in Article 71 of the Constitution.

12. Discharge of President's functions in other contingencies: In certain situations where the President is unable to discharge their functions due to absence, illness, or any other cause, the Vice-President may act as President or discharge his functions until the President resumes office.

13. Matters relating to, or connected with, the election of a President or Vice-President: Various provisions in the Constitution deal with matters such as disputes arising out of the election, qualifications for membership in electoral college, and disqualification from voting or being elected as President or Vice-President.

14. Power of President to grant pardons, etc., and to suspend, remit or commute sentences in certain cases: The President has the power to grant pardons, reprieves, respites, or remissions of punishment, or to suspend, remit, or commute the sentence of any person convicted of any offense.

15. Extent of executive power of the Union: The executive power of the Union extends to the whole of India and includes the power to make appointments, to confer honors and titles, and to do all other acts necessary for the proper functioning of the government.