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How many four-digit numbers N = abcd satisfy all of the following conditions?

1. 4000 <= N < 6000

2. N is a multiple of 5.

3. N is not a mutlple of 3

 Jun 25, 2021
 #1
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Multiples  of  5   =  [ 5995  - 4000  ]  / 5   + 1  =  400  

 

Multiples   of 5*3 = 15   =    [  5985 - 4005] /15  + 1   = 132  + 1 =    133

 

 

Number (mult of 5  but not a mult of 3)=    400    -  133      =   267

 

 

cool cool cool

 Jun 25, 2021

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