排列3直选多少种组合呢，全包呢，909种？

排列3直选多少种组合呢，全包呢，909种？

1000~~注~~~000,001,002,003,004,005,006,007,008,009010,011,012,013,014,015,016,017,018,019020,021,022,023,024,025,026,027,028,029030,031,032,033,034,035,036,037,038,039040,041,042,043,044,045,046,047,048,049050,051,052,053,054,055,056,057,058,059060,061,062,063,064,065,066,067,068,069070,071,072,073,074,075,076,077,078,079080,081,082,083,084,085,086,087,088,089090,091,092,093,094,095,096,097,098,099100,101,102,103,104,105,106,107,108,109110,111,112,113,114,115,116,117,118,119120,121,122,123,124,125,126,127,128,129130,131,132,133,134,135,136,137,138,139140,141,142,143,144,145,146,147,148,149150,151,152,153,154,155,156,157,158,159160,161,162,163,164,165,166,167,168,169170,171,172,173,174,175,176,177,178,179180,181,182,183,184,185,186,187,188,189190,191,192,193,194,195,196,197,198,199200,201,202,203,204,205,206,207,208,209210,211,212,213,214,215,216,217,218,219220,221,222,223,224,225,226,227,228,229230,231,232,233,234,235,236,237,238,239240,241,242,243,244,245,246,247,248,249250,251,252,253,254,255,256,257,258,259260,261,262,263,264,265,266,267,268,269270,271,272,273,274,275,276,277,278,279280,281,282,283,284,285,286,287,288,289290,291,292,293,294,295,296,297,298,299300,301,302,303,304,305,306,307,308,309310,311,312,313,314,315,316,317,318,319320,321,322,323,324,325,326,327,328,329330,331,332,333,334,335,336,337,338,339340,341,342,343,344,345,346,347,348,349350,351,352,353,354,355,356,357,358,359360,361,362,363,364,365,366,367,368,369370,371,372,373,374,375,376,377,378,379380,381,382,383,384,385,386,387,388,389390,391,392,393,394,395,396,397,398,399400,401,402,403,404,405,406,407,408,409410,411,412,413,414,415,416,417,418,419420,421,422,423,424,425,426,427,428,429430,431,432,433,434,435,436,437,438,439440,441,442,443,444,445,446,447,448,449450,451,452,453,454,455,456,457,458,459460,461,462,463,464,465,466,467,468,469470,471,472,473,474,475,476,477,478,479480,481,482,483,484,485,486,487,488,489490,491,492,493,494,495,496,497,498,499500,501,502,503,504,505,506,507,508,509510,511,512,513,514,515,516,517,518,519520,521,522,523,524,525,526,527,528,529530,531,532,533,534,535,536,537,538,539540,541,542,543,544,545,546,547,548,549550,551,552,553,554,555,556,557,558,559560,561,562,563,564,565,566,567,568,569570,571,572,573,574,575,576,577,578,579580,581,582,583,584,585,586,587,588,589590,591,592,593,594,595,596,597,598,599600,601,602,603,604,605,606,607,608,609610,611,612,613,614,615,616,617,618,619620,621,622,623,624,625,626,627,628,629630,631,632,633,634,635,636,637,638,639640,641,642,643,644,645,646,647,648,649650,651,652,653,654,655,656,657,658,659660,661,662,663,664,665,666,667,668,669670,671,672,673,674,675,676,677,678,679680,681,682,683,684,685,686,687,688,689690,691,692,693,694,695,696,697,698,699700,701,702,703,704,705,706,707,708,709710,711,712,713,714,715,716,717,718,719720,721,722,723,724,725,726,727,728,729730,731,732,733,734,735,736,737,738,739740,741,742,743,744,745,746,747,748,749750,751,752,753,754,755,756,757,758,759760,761,762,763,764,765,766,767,768,769770,771,772,773,774,775,776,777,778,779780,781,782,783,784,785,786,787,788,789790,791,792,793,794,795,796,797,798,799800,801,802,803,804,805,806,807,808,809810,811,812,813,814,815,816,817,818,819820,821,822,823,824,825,826,827,828,829830,831,832,833,834,835,836,837,838,839840,841,842,843,844,845,846,847,848,849850,851,852,853,854,855,856,857,858,859860,861,862,863,864,865,866,867,868,869870,871,872,873,874,875,876,877,878,879880,881,882,883,884,885,886,887,888,889890,891,892,893,894,895,896,897,898,899900,901,902,903,904,905,906,907,908,909910,911,912,913,914,915,916,917,918,919920,921,922,923,924,925,926,927,928,929930,931,932,933,934,935,936,937,938,939940,941,942,943,944,945,946,947,948,949950,951,952,953,954,955,956,957,958,959960,961,962,963,964,965,966,967,968,969970,971,972,973,974,975,976,977,978,979980,981,982,983,984,985,986,987,988,989990,991,992,993,994,995,996,997,998,999