By which Constitutional Amendment the voting age was reduced from 21 years to 18 years?

Voting right by the youths at the age of 18 years was exercised for the first time in the General Election of

Given below are two statements, one is labelled as Assertion (A) and other as Reason (R) : Assertion (A) : The President can recommend to the Parliament to change the boundary of any state after seeking views of the concerned Legislature of that state on the subject within specified period. Reason (R) : It is not mandatory for the President to accept the proposal of the concerned State Legislature. Select the correct answer using the code given below–

By which amendment of the Constitution, ‘Delhi’ has been made National Capital Region?

Formation of new States or transformation in the borders and names of the States Code:

The concept of ‘Basic Structure of the Constitution’ was propounded by the Supreme Court in the case of