[" digits may be repeated any number of thrits "1,2,3,4,3,2,1" taken all together "],[" How many numbers can be formed with the odd places."],[" so that the odd digits always occupy the odd places."],[" so that the odd digits always occupy the odd places."],[" How many different numbers of six digits can be formed out of the digits "1,1,1,2,2,3],[" How many different numbers of six digoool? "],[" How many of them are greater than "30000" can be formed by the digits "3,5,6,6,7?]