
Let’s look at the sequence of digits: 1, 2, 3, 4, 5, 6…
Where had number seven hidden itself? At first glance in the given sequence there is no seven.
But when we look a bit closer again:
1, 2, 3, 4, 5, 6, 7…
…number seven can be easily seen.
How does it happen?
It’s only just a simple example of the illusory character of some mathematical data. It’s an arithmetic trick using human brain properties. 