Question

how many integers between 999 and 9999 are divisible by 3 or 5 or 7 soluton​

Answer 1

Step by step explantion

The integers which are between 999 and divisible by 2 are the even 4 digit numbers. There are (9998/2- 998/2) or (10000/2- 100/2) =5000- 500

=450 such numbes

The integers which are between 999 and 9999 are divisible by 5 are the 4 digit numbers divisible by 5. There are (9995/5-995/5 )or ( 10000/5 - 1000/5)

=2000-200

=1800 such numbers