How many 6 digit numbers contain exactly 4 different digits
Asked by admin @ in Math viewed by 455 People
How many 6 digit numbers is contain exactly 4 different digits?
Answered by admin @
Hey Here is your answer....
Let's chose any 4 digits including 0which we can use to make the required number that's 10C4.
Now let's place these chosen 4 on the six required places to make the six digit number that's 4^6.
Lets subtract all such numbers who had a zero at the beginning as it would make the number 5 digit one.....
Hope it's helpful
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