A monkey ascends a greased pole 12 metres high. He ascends 2 metres in first minute and slips down 1 metre in the alternate minute. In which minute, he reaches the top ?

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$21 st$

$22 nd$

$23 rd$

$24 th$

answer is A.

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Detailed Solution

In 2 minutes, he ascends= 1 metre .

$∴$ 10 metres, he ascends in 20 minutes

$∴$ He reaches the top in 21st minute.

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