find natural numbers between 20 to 80 and are divisible by 3
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The numbers are as follows :- 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78,
The reason is that if we add any digits in a number and then if the sum of the particular number is divisible by three then the whole number is divisible by 3. Eg:- 78= 7+8= 15 ( 3*5= 15 )
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