tim so co 2 chu so biet rang neu viet them chu so 0 vao giua 2 chu so do duoc so co 3 chu so gap 9 lan so da cho
tim tat ca cac so co 2 chu so biet rang neu viet them vao giua hai so do mot chu so 3 thi duoc mot so moi gap 11 lan so can tim
tim so co hai chu so biet rang neu viet them chu so 0 xen vao giua hai chu so cua so do ta duoc so moi gap 66 lan so can tim.
tim so tu nhien co 2 chu so ,biet rang neu viet them chu so 0 xen giua chu so hang chuc va hang don vi cua so do ta duoc so moi gap 10 lan so can tim .Neu viet them chu so 1 vao ben trai so vua nhan duoc thi so do gap len 3 lan.
tim so co hai chu so biet rang neu ta viet hem chu so 1 vao giua ta duoc so moi gap 9 lan so phai tim
tìm tất cả các số co hai chu so biet rang neu viet them vao giua so do mot so 3 thi duoc so moi gap 11 lan so can tim
tim 1 so co 2 chu so biet rang neu viet them chu so 12 vao ben trai so do ta duoc 1 so gap 26 lan so can tim
tim so tu nhien co 2 chu so neu viet them chu so 0 xen giua chu so hang chuc va hang don vi cua so do ta duoc so moi gap 10 lan so can tim . neu viet them chu so 1 vao ben trai so vua nhan duoc thi so do gap len 3 lan . so can tim
tim so co 2 chu so biet rang neu viet them vao truoc va sau so do 1 chu so 1 ta duoc 1so co 4 chu so gap 23 lan so phai tim