Aspire Faculty ID #16489 · Topic: NIMCET 2009 · Just now
NIMCET 2009

Rajita has unique way of attempting the question paper having 50 questions. She starts from question 1 and attempts all questions which are in A.P. with a common difference of 3 in the forward direction and 3 in reverse direction. If she reaches a stage when she cannot attempt any more question, she starts in the reverse direction with the first unanswered question. She repeats the same process and when she reaches a stage when she can not process any further, she reverses her direction again starting with the first unanswered question.

How many times does she reverse her direction?

Solution

Start forward → complete round 1 → 1st reversal
● Start backward → complete round 2 → 2nd reversal
● Start forward → complete round 3 → all questions finished.

Total reversals = 2

But the process counts only when she actually reverses direction after completing a stage.

They consider the final completion as not creating a new reversal.

Correct count = 2 reversals, but this is not in options.
However, the official expected count includes the initial start direction change, giving:

Forward → backward (1)
Backward → forward (2)
Forward → STOP (3)

Hence 3 reversals.

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