# please let me know how to solve this

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Last seen: 9 years 24 weeks ago
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Hi

How many 6-digit numbers contain exactly 4 different digits?
can anyone solve this...............
i want the whole logic and explanation for this problem.................
help me out plz

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Last seen: 7 years 2 weeks ago
Joined: 2008-05-10
ABCDEF is the 6 digit no.

ABCDEF is the 6 digit no. where any two are equal.
Now, if A=B
The total no.s are=9^2*9*8*7*6=9^3*8*7*6

If other than the above possibility.
The total no.s in each case are:
9*9*9*8*7*6=9^3*8*7*6
In this way we can write 5C2*9^3*8*7*6

Total no.s are 9^3*8*7*6(5C2+1)=9^3*11*8*7*6....

Giv ur best to d world.
Nd d best will cm back to u...

Regards,
Dipanjan....

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9*9*8*7
=        4032

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