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i. How many 4 digit number can be formed...

i. How many 4 digit number can be formed using the digits 3, 5, 8, 9 if repetition is not allowed?
ii. How many of these numbers end in 3?
iii. How many of the above numbers mentioned in (i) ends in 3 or 5?

Text Solution

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The correct Answer is:
i. `""^(4)P_(4)=4! =24`
ii. `""^(3)P_(3)xx1=3! =6`
iii. 12
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