Question
Question: How many 6 digit number can be formed using the digit 1, 2, 3, 4, 5 and 6 that have at least two of ...
How many 6 digit number can be formed using the digit 1, 2, 3, 4, 5 and 6 that have at least two of the digits the same:
A
6(65 –5!)
B
66
C
6!
D
66 – 5!
Answer
6(65 –5!)
Explanation
Solution
Required = total – All different digits
= 66 – 6! = 6(65 – 5!)