A bus starts with full of passengers . At the first station , it drops 1/3 of passengers and take 1/7 of passengers in the beginning .
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It is easy to solve first we will subtract the 1/3 passengers from the beggining passengers to get the answer 1/3-1/7 the lcm of the 7 and three is 21 so we will do subtract and the answer will be 4/21
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