1 |___|
2|___||1_|
3|___||1_|1_|
4 |___||1_|1_||1_|
5 |___||1_|1_||1_||1_|
6 |___||1_|1_||1_|1_||1_|
7 |___||1_|1_||1_|1_||1_||1_|
28-21=7 ( 7 segmente egale)
7:7=1 ( un seg sau nr. 1)
1+1=2 ( 2 )
1+1+1=3 (3)
1+1+1+1=4 (4)
1+1+1+1+1=5 (5)
1+1+1+1+1+1=6 (6)
1+1+1+1+1+1+1=7 (7)
Numerele sunt : 1,2,3,4,5,6,7.
1×2×3×4×5×6×7=5,040
