How many 4 -digit numbers can be arranged from the digit 1,3,5,6,8 and 9 if repetition is allowed?

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How many 4 -digit numbers can be arranged from the digit 1,3,5,6,8 and 9 if repetition is allowed?​

 

Answer:

So the total number of 4 digit numbers that can be formed using the digits 1 to 9 if the repetition are not allowed are 9x8x7x6 = 3024.

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