question_answer

The total number of integers between 200 and 400, each of which either begins with 3 or ends with 3 or both, is

A) 10

B)  100    

C)  110

D)  120

Correct Answer: C

Solution :

When 3 lies at hundreds place \[\therefore \]Total integers \[=10\times 9=90\] When 3 lies at units place Total integers = 10 When 3 lies at unit's and hundred's place Total integers = 10 Total integers \[=90+10+10=110\]