Many thanks to all those who supplied solutions where I failed, or pointed out errors, or supplied better solutions. There are still some solutions which are clumsy or inelegant, and maybe even some which are wrong (although I am not aware of any). All suggestions for improvement would be most welcome. It would also be good to supply hints which just gave the key idea. Any contributions welcome. [email: jscholes@kalva.demon.co.uk]

 

Archive
1st IMO 1959   pdf 2nd IMO 1960   pdf
3rd IMO 1961   pdf
4th IMO 1962   pdf
5th IMO 1963   pdf
6th IMO 1964   pdf
7th IMO 1965   pdf
8th IMO 1966   pdf
9th IMO 1967   pdf
10th IMO 1968   pdf
11th IMO 1969   pdf 		12th IMO 1970   pdf
13th IMO 1971   pdf
14th IMO 1972   pdf
15th IMO 1973   pdf
16th IMO 1974   pdf
17th IMO 1975   pdf
18th IMO 1976   pdf
19th IMO 1977   pdf
20th IMO 1978   pdf
21st IMO 1979   pdf 		No IMO 1980!
22nd IMO 1981   pdf
23rd IMO 1982   pdf
24th IMO 1983   pdf
25th IMO 1984   pdf
26th IMO 1985   pdf
27th IMO 1986   pdf
28th IMO 1987   pdf
29th IMO 1988   pdf
30th IMO 1989   pdf 		31st IMO 1990   pdf
32nd IMO 1991   pdf
33rd IMO 1992   pdf
34th IMO 1993   pdf
35th IMO 1994   pdf
36th IMO 1995   pdf
37th IMO 1996   pdf
38th IMO 1997   pdf
39th IMO 1998   pdf
40th IMO 1999   pdf 		41st IMO 2000   pdf
42nd IMO 2001   pdf
 
 
 
 

Thru 2001 there were 42 IMOs, each with 6 problems, except for 1960 and 1962 which each had 7, giving a total 254 problems in all. I have numbered them randomly from 1 to 254.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254
This has the advantage of no links to the solutions, for those who want to make it difficult for themselves to cheat.  
 
 
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John Scholes
jscholes@kalva.demon.co.uk
12 Aug 2001