how many 10 digit numbers are there such that the sum of their digit is 3?
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How many 10 digit numbers are there so the sum of the digits is 2?
combinatorics elementary-number-theory contest-math
How many 10 digit numbers are there so the sum of the digits is 2?
abcdefghij is the 10 digit number. By default, a=1 is a must.
=1bcdefghij
Now we need: bcdefghij=1
How can I solve this combinatorically? Not by checking and substitution?
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