1.3 7.9 C-8 + The sum of infinite s...
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1.3 7.9 C-8 + The sum of infinite series + (A)21 (B)22 (C)23 (D) 24

JEE/Engineering Exams
Maths
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( S_{n}=frac{1.3}{2}+frac{3.5}{2^{2}}+frac{S cdot 7}{2^{3}}+frac{7 cdot 9}{2^{4}}+cdots ) ( frac{s_{n}}{2}=frac{1 cdot 3}{2^{2}}+frac{3 cdot 5}{2^{3}}+frac{5 cdot 7}{2^{4}} ) ( frac{5 n}{2}=frac{1 cdot 3}{2}+frac{1}{2^{2}} 3(4)+frac{1}{2^{3}} cdot(9)+frac{7}{2^{4}}(4)+ ) ( sin =1.3+frac{1}{2} 4.3+frac{1}{2^{2}} 4.5+frac{7.4}{2^{3}} ) ( s^{prime} n=3+frac{2}{2}+frac{2}{2^{2}}+frac{2}{23} ) ( S_{n}^{prime}=3+1+frac{1}{2^{2}}+frac{1}{2^{2}}+-cdots ) ( S_{n}=3+frac{1}{1-frac{2}{2}}=3+frac{2}{1}=C )
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