Only 220 of the 1000 three-digit numbers are called pattis. Don’t get confused while deciding on three digit numbers; simply remember that all pattis are always in increasing sequence. For example, 234 is a 220 patti, however 432,876,654 do not qualify as 220 pattis. There are only 220 distinct integers that, when put in rising or ascending sequence, qualify to create a panna. If you arrange 124, 421,241 in ascending order, only 124 is the right answer. More information may be found at 220 Patti, 220patti.com.