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The very first step you have to do is take the LCM of the 3 numbers which is 24. The least number of these 3 digits is 100(100 is the smallest 3 digit number). So 100/24 is 4.16 which is rounded to 4. The equation for this is 100+(24-4) which gives 120. Therefore the smallest 3 digit number which is exactly equal to 6,8 and 12 is 120. 

Hope this answer helped :).
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