Big number

Dagmar typed numbers on the computer (without spaces) 45678910111213141516... Which number did she write in the third place?

Correct answer:

x =  7

Step-by-step explanation:


1: 4567891011
11: 1213141516
21: 1718192021
31: 2223242526
41: 2728293031
51: 3233343536
61: 3738394041
71: 4243444546
81: 4748495051
91: 5253545556
101: 5758596061
111: 6263646566
121: 6768697071
131: 7273747576
141: 7778798081
151: 8283848586
161: 8788899091
171: 9293949596
181: 9798991001
191: 0110210310
201: 4105106107
211: 1081091101
221: 1111211311
231: 4115116117
241: 1181191201
251: 2112212312
261: 4125126127
271: 1281291301
281: 3113213313
291: 4135136137
301: 1381391401
311: 4114214314
321: 4145146147
331: 1481491501
341: 5115215315
351: 4155156157
361: 1581591601
371: 6116216316
381: 4165166167
391: 1681691701
401: 7117217317
411: 4175176177
421: 17817



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