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hardest math question I've encountered

Mathematics
Tutor: None Selected Time limit: 1 Day

Jan 7th, 2015

there can be these many possibilities : 219

1001, 1010, 1100, 2002, 2011, 2020, 2101, 2110, 2200, 3003, 3012, 3021, 3030, 3102, 3111, 3120, 3201, 3210, 3300, 4004, 4013, 4022, 4031, 4040, 4103, 4112, 4121, 4130, 4202, 4211, 4220, 4301, 4310, 4400, 5005, 5014, 5023, 5032, 5041, 5050, 5104, 5113, 5122, 5131, 5140, 5203, 5212, 5221, 5230, 5302, 5311, 5320, 5401, 5410, 5500, 6006, 6015, 6024, 6033, 6042, 6051, 6060, 6105, 6114, 6123, 6132, 6141, 6150, 6204, 6213, 6222, 6231, 6240, 6303, 6312, 6321, 6330, 6402, 6411, 6420, 6501, 6510, 6600, 7007, 7016, 7025, 7034, 7043, 7052, 7061, 7070, 7106, 7115, 7124, 7133, 7142, 7151, 7160, 7205, 7214, 7223, 7232, 7241, 7250, 7304, 7313, 7322, 7331, 7340, 7403, 7412, 7421, 7430, 7502, 7511, 7520, 7601, 7610, 7700, 8008, 8017, 8026, 8035, 8044, 8053, 8062, 8071, 8080, 8107, 8116, 8125, 8134, 8143, 8152, 8161, 8170, 8206, 8215, 8224, 8233, 8242, 8251, 8260, 8305, 8314, 8323, 8332, 8341, 8350, 8404, 8413, 8422, 8431, 8440, 8503, 8512, 8521, 8530, 8602, 8611, 8620, 8701, 8710, 8800, 9009, 9018, 9027, 9036, 9045, 9054, 9063, 9072, 9081, 9090, 9108, 9117, 9126, 9135, 9144, 9153, 9162, 9171, 9180, 9207, 9216, 9225, 9234, 9243, 9252, 9261, 9270, 9306, 9315, 9324, 9333, 9342, 9351, 9360, 9405, 9414, 9423, 9432, 9441, 9450, 9504, 9513, 9522, 9531, 9540, 9603, 9612, 9621, 9630, 9702, 9711, 9720, 9801, 9810, 9900

Jan 7th, 2015

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Jan 7th, 2015
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Jan 7th, 2015
Dec 11th, 2016
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