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How many 6-digit numbers can be formed f...

How many 6-digit numbers can be formed from the digits 0,3,5,7 and 9 which are divisible by 10 and no digits is repeated?

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Since numbers are divisible by 10, so there will always be 0 at unit place.
No. of ways of placing remaining 5 digits at 5 places
`= .^(5)P_(5) = 5! = 120`
Total numbers `= 120`
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