Question

totalul numerelor cu cifra 9la zeci numai de 4cifre

Answer 1

1090.1091,1092,1093,1094,1095,1096,1097,1098,1099,1190,1191,1192,1193,1194,1195,1196,1197,1198,1199,1290,1291,1293,1294,1295,1296,1297,1298,1299,1390,1391,1394,1395,1396,1397,1398,1399,1490,1491,1492,1493,1495,1496,1497,1498,1499,1590,1591,1592,1593,1594,1596,1597,1598,1599

Answer 2

intre 1090 si 1990 sunt 10 nr care au 9 la zeci
intre 1090 si 9990 sunt 90 de numere