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Grade 12th passAlgebra

These questions are from permutations combination please solve questions 40,41,42

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Profile image of Atul Tiwari
9 Years agoGrade 12th pass
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1 Answer

Profile image of Nishant Vora
9 Years ago
distance travelled on kth day =k (2^{n+1-k})

Total distance travelled =\sum_{k=1}^{n}k (2^{n+1-k})

\sum_{k=1}^{n}k (2^{n+1}{2^-k})
\sum_{k=1}^{n}k (2^{n+1}){2^{-k}}

(2^{n+1})\sum_{k=1}^{n}k {2^{-k}}