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A person learnt 100 words for an English...

A person learnt 100 words for an English test. The number of words the person remembers in t days after learning is given by `W(t)=100xx(1-0.1t)^(2), 0 le t le 10`. What is the rate at which the person forgets the words 2 days after learning ?

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That is, the person forget at the rate 16 words after 2 days of studying.
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FULL MARKS-APPLICATIONS OF DIFFERENTIAL CALCULUS -ADDITIONAL QUESTIONS SOLVED
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