26.If ? denotes the number of permutations of x+2 things taken all at a time the number of permutation of x things taken 11 at a time and c the number of permutations of x-11 things taken all at a time such that a=182 bc, then the value of x is

27.The total number of 9 digit numbers which have all different digits is

28.The number of 3 digits numbers lying between 100 and 999 inclusive and having only two consecutive digits identical is

29.How many different nine digit numbers can be formed from the number 223355888 by rearranging its digits so that odd digits occupy even positions?