Sum or Difference Numbers make me silly
Number Theory
Level
4
There exist 4 digit numbers ABCD such that A+B+C = D, or A-B-C = D. How many 4 digit numbers satisfy at least one of these conditions? An example of this is 1001, as 1+0+0 = 1.
The answer is 368.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
0 solutions
No explanations have been posted yet. Check back later!