Question

How many integers between 1 and 1,000,000 contain the digit 5 at least twice?

Answer 1

there are 10 integers betweem 1 to 1000
55
155
255
355
455
555
655
755
855
955
therefore, between i and 100000(1000*1000);
there will be 10*1000=10000 such integers.

Answer 2

there are 10 integers betweem 1 to 1000
55
155
255
355
455
555
655
755
855
955
therefore, between 1 and 100000
there will be 10*1000=10000 such integers.