@ben: permutation and combination chuan chawh theih chiang e, mahse a har reuh khawpmai.
how to tackle this problem:
box pathum zinga pahnih thlanchhuah atangin eng card pawh pawt ila box combination dang pahnih atanga kan pawh nen a belhkhawm a inanglo tur ani.
Odd no’s leh even no’s te dah hran a ngaih ka ring deuh……ka ngaihtuah peih toh lo(Sunday school exam bak exam ka tum tawh chuang lo keichu)
Lastly,the magician must be good with numbers.