При k=7
k+6=7+6=13, 28-k=28-7=21
При k=8
k+6=8+6=14, 28-8=28-8=20
При k=9
k+6=9+6=15, 28-k=28-9=19
При k=10
k+6=10+6=16, 28-k=28-10=18
7+6=13
8+6=14
9+6=15
10+6=16
28-7=21
28-8=20
28-9=19
28-10=18
При k=7
k+6=7+6=13, 28-k=28-7=21
При k=8
k+6=8+6=14, 28-8=28-8=20
При k=9
k+6=9+6=15, 28-k=28-9=19
При k=10
k+6=10+6=16, 28-k=28-10=18
7+6=13
8+6=14
9+6=15
10+6=16
28-7=21
28-8=20
28-9=19
28-10=18