Rearrange the following into correct sentence:
It has been established that
(P) Einstein was
(Q) although a great scientist
(R) weak in arithmetic
(S) right from his school days

QPRS

The correct answer is option 2. QPRS.

It has been established that although a great scientist Einstein was weak in arithmetic right from his school days.

Let us break down the arrangement "QPRS":

Q: This starts the sentence by introducing a contrast - "although a great scientist."

P: Following "Q," this segment specifies the subject - "Einstein was."

R: Next, "R" adds detail to the subject mentioned in "P" - "weak in arithmetic."

S: Finally, "S" concludes the sentence by providing additional information about the timing of this weakness - "right from his school days."

So, when arranged as "QPRS," the sentence flows logically from introducing the contrast to describing the subject and providing additional details.