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How many 4 - digit numbers are there wit...

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

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The numbers can be formed by using digits 0 to 9.
Number of 4 - digit numbers `= .^(10)P_(4)-.^(9)P_(3)`
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SUBHASH PUBLICATION-PERMUTATIONS AND COMBINATIONS -2/3 MARKS QUESTIONS WITH ANSWERS
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