Q. A box contains tickets numbered from 0 to 999999 . The probability of getting a ticket- with sum of digits on it being equal to 21 is given by , find the value of .

 34  122 Probability - Part 2 Report Error

Answer: 48

Solution:

Concept: Coefficient if in
coefficient of in
(six digit starting with 000000,000001 etc. each place can have digit from 0 to 9)