raf1061

There are 9 digits to be considered. Because 0 shouldn't be of any concern. Now lets see, how many total permutation is possible (including repeatation). This is, 9*9*9=729 How many permutation possible if all the numbers are same? It is 9 How many permutation are possible all the numbers are different? It is 9*8*7=504 So our answer here is 729-9-504= 216

The answer should be D. As there is no mentioning about the nature of the distribution. It could have been Uniform distribution or normal distribution