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How many positive integers up to 2012 have the ones (units) digit either 1 or 8?

 Mar 30, 2021
 #1
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In every  hundred, we will  have  20  integers   that satisfy  this

 

So    20 (hundreds) * 20 ( occurnces in each hundred)  =  400

 

And we  have three more occurences  from 2001 - 2012

 

So

 

400  + 3   =

 

403  occurences

 

 

cool cool cool

 Mar 30, 2021

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