UPSC CSE Prelims 2004 Q136 — Science & Technology PYQ

2004Q136·Science & Technology·Quantitative Aptitude

How many three-digit even numbers are there such that 9 comes as a succeeding digit in any number only when 7 is the preceding digit, and 7 is the preceding digit only when 9 is the succeeding digit?

UPSC CSE Prelims 2004 Q136 — Science & Technology PYQ with Answer

UPSC CSE Prelims 2004 Q136 — Science & Technology PYQ with Answer