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A man is climbing up a mountain which isinclined. He has to travel 100 km to reach topof mountain. Every day He climbs up 2 kmforward in day time. Exhausted, he then takesrest there at night time. At night, while he isasleep, he slips down 1 km backward becausemountain is inclined.Then how many days does it take him toreach mountain top ????

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