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How many 4-digit numbers are not divisible by 7?

 Aug 5, 2020
 #1
avatar+28021 
+1

from 1000 to 9999  is   9000 numbers

   stating with 1001  and ending with 9996    there are   9000/7 =~ 1286 numbers  ARE divisible by 7....

          you can finish.....

 Aug 5, 2020
 #2
avatar+169 
+2

YEE complementary counting!

yes

so basically, what that is guest is you count the solutions you DONT want, then subtract. This is because it is sometimes faster this way.

Inspirational  Aug 6, 2020

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