排列3直选多少种组合呢，全包呢，909种？

1000~~注~~~
000,001,002,003,004,005,006,007,008,009
010,011,012,013,014,015,016,017,018,019
020,021,022,023,024,025,026,027,028,029
030,031,032,033,034,035,036,037,038,039
040,041,042,043,044,045,046,047,048,049
050,051,052,053,054,055,056,057,058,059
060,061,062,063,064,065,066,067,068,069
070,071,072,073,074,075,076,077,078,079
080,081,082,083,084,085,086,087,088,089
090,091,092,093,094,095,096,097,098,099
100,101,102,103,104,105,106,107,108,109
110,111,112,113,114,115,116,117,118,119
120,121,122,123,124,125,126,127,128,129
130,131,132,133,134,135,136,137,138,139
140,141,142,143,144,145,146,147,148,149
150,151,152,153,154,155,156,157,158,159
160,161,162,163,164,165,166,167,168,169
170,171,172,173,174,175,176,177,178,179
180,181,182,183,184,185,186,187,188,189
190,191,192,193,194,195,196,197,198,199
200,201,202,203,204,205,206,207,208,209
210,211,212,213,214,215,216,217,218,