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how many 10-digit numbers are there, such that the sum of the digits is divisible by 2?
 

 Apr 18, 2020
 #1
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[9,999,999,998 - 1,000,000,000] / 2  + 1 =4,500,000,000 such numbers

 Apr 18, 2020
 #2
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[9,999,999,999 - 1,000,000,001] / 2 + 1 =4,500,000,000 - such numbers (same as above).

 Apr 18, 2020
 #3
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Thanks to you guys, I learned how to do problems like this in the future!

 Apr 19, 2020

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