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Find the sum of all possible 4 digits numbers that can be formed using digits 1,2,3,4
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Answer:
84
Step-by-step explanation:
Four digit numbers =4⋅3⋅2⋅1=24 ways we can form a four digit number. Since it's a 4 digit number, each digit will appear 6=24/4 times in each of units, tens, hundreds, and thousands place. Therefore, the sum of digits in the units place is 6(1+2+5+6)=84.
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