UPSC CSE Prelims 2008 Q3 — Science & Technology PYQ

2008Q3·Science & Technology·Quantitative Aptitude

In how many different ways can four books A, B, C and D be arranged one above another in a vertical order such that the books A and B are never in continuous position?

UPSC CSE Prelims 2008 Q3 — Science & Technology PYQ with Answer

UPSC CSE Prelims 2008 Q3 — Science & Technology PYQ with Answer