You can make 24 4-digit numbers. 1111 2222 3333 4444 5555 6666 1234 2345 3456 1356 6543 5432 4321 1432 ok i give up!
(7777-6666)/1111 = 1 (4444+5555)/(9999/3333) = 3 8888/2222 = 4 4*3 + 1 =13
There are 18 111, 222, 333, 444, 555, 666, 777, 888, 999, 1111, 2222, 3333, 4444, 5555, 6666, 7777. 8888. 9999
1111...2222....3333....4444....5555....6666....7777....8888....9999....0000....1112....1113....1114....1115....1116....1117....1118....1119....1110....1120....1121....1122....1123....1124...1125....1126....1127....1128....1129....1130....1131....11
21
You can make 24 4-digit numbers. 1111 2222 3333 4444 5555 6666 1234 2345 3456 1356 6543 5432 4321 1432 ok i give up!
(7777-6666)/1111 = 1 (4444+5555)/(9999/3333) = 3 8888/2222 = 4 4*3 + 1 =13
There are 18 111, 222, 333, 444, 555, 666, 777, 888, 999, 1111, 2222, 3333, 4444, 5555, 6666, 7777. 8888. 9999
2222= 3 mod 7 5555 = 4 mod 7 2222^5555 + 5555^2222 = (3^5)^1111 + (4^2)^ 1111 as it is a^n + b^n and n is odd so it is divisible by (a+b) 3^5 + 4^ 2 = 259 hence by 7 as 7 is a factor of 259
1111...2222....3333....4444....5555....6666....7777....8888....9999....0000....1112....1113....1114....1115....1116....1117....1118....1119....1110....1120....1121....1122....1123....1124...1125....1126....1127....1128....1129....1130....1131....11
21
Try putting in 0000 1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, or 9999 it's most likely one of them. If this doesn't work, then I would suggest putting in random numbers. If none of these work, then it would just be best to go to the phone store or call customer service.
5555-4444+5555
Not
9/3 + 9+ 5+ 3+ 1
9/3+9+5+3+1=21
0.5555 = 5555/10000 = 1111/2000