Răspuns :
Divizorii lui 4={4,8,12,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96,100,104,108, 112,116,120,124,128,132,136,140,144,148,152,156,160,164,168,172,176,180,184,188,192,196,200,204,208,212,216,220,224,228,232,236,240,244,248,....}
Divizorii lui 3={3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81, 84,87,90,93,96,99,102,105,108,111,114,117,120,123,126,129,132,135,138,141,144,147,150,153,156,159,162,165,168,171,174,177,180,183,186,189,192,195, 198,201,204,207,210,213,216,219,222,225,228,231,234,237,240,243,246,249,...}
Divizorii nr 3 intersectat cu nr 4={12,24,36,48,60,72,84,96,108,120,132,144,156,168,180,192,204,216,228,240,...}
a)Deci vor fi 20 de pagini
b)Divizorii lui 3 pana la 250 sunt 83 de nr=83 de pagini
Divizorii lui 4 pana la 250 sunt 62 de nr=62 de pagini
1+83+62=146 de pagini sunt scrise
250-146=104 de pagini sunt albe
Divizorii lui 3={3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81, 84,87,90,93,96,99,102,105,108,111,114,117,120,123,126,129,132,135,138,141,144,147,150,153,156,159,162,165,168,171,174,177,180,183,186,189,192,195, 198,201,204,207,210,213,216,219,222,225,228,231,234,237,240,243,246,249,...}
Divizorii nr 3 intersectat cu nr 4={12,24,36,48,60,72,84,96,108,120,132,144,156,168,180,192,204,216,228,240,...}
a)Deci vor fi 20 de pagini
b)Divizorii lui 3 pana la 250 sunt 83 de nr=83 de pagini
Divizorii lui 4 pana la 250 sunt 62 de nr=62 de pagini
1+83+62=146 de pagini sunt scrise
250-146=104 de pagini sunt albe