Let x be a rational number whose decimal expansion terminates.Then x can be expressed in the form p/q,where p and q are co prime,and the prime factorization of q is of the form 2^n5^m where n,m are non negative integers
doctors in a college are to be 10 ground into groups, 5 in each group. Each group is then to elect a president, vice _president and secretary. In how many ways can this be done.