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How many 4-digit numbers are there …

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How many 4-digit numbers are there with no digit repeated?☺️☺️☺️☺️☺️☺️

Posted by Aashu Kumar 6 years, 3 months ago

CBSE > Class 11 > Mathematics

2 answers

Saurav Dutta 6 years, 3 months ago

9*8*7*6=?

Shivang Thakur 6 years, 3 months ago

Total no of digits =4 4 vaccent places can be filled with10P 4 WAYS but this no include those no whi start with zero If we find zero at thousands place then the remaining 3 places can be filled with remaining 9 digits in 9p 3 ways so Total no of 4 digit no = 10p 4-9p 4 10!/(10-4)! -9!/(9-3)! 10*9*8*7*6! - 9*8*7*6! --------------------- -------------- 6! 6! =90*56-72*7 =5040-504 =4536 ans Hope it will help you?

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