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

 May 23, 2020
 #1
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First number =1000000001

Last number =9999999999

 

[9999999999 - 1000000001] / 2  + 1 =4,500,000,000 such numbers.

 May 23, 2020

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