Step 1: Identify the opening sentence
Option (D) raises a question: why only apply out-of-box thinking to Pakistan? This clearly sets up the discussion.
So, D should be the first sentence.
Step 2: Follow up with supportive evidence
Option (A) explains how the PM did apply thought to reservation issues – this logically follows the question in (D).
So, A should follow.
Step 3: Link to current affairs or decisions
Option (B) then explains his unconventional Pakistan policy – relevant to D.
Then (C) reflects back on the PM’s thought process and rhetorical doubt.
Sequence: D \( \rightarrow \) A \( \rightarrow \) B \( \rightarrow \) C
For any natural number $k$, let $a_k = 3^k$. The smallest natural number $m$ for which \[ (a_1)^1 \times (a_2)^2 \times \dots \times (a_{20})^{20} \;<\; a_{21} \times a_{22} \times \dots \times a_{20+m} \] is: