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NCERT Class XI Mathematics - Binomial Theorem - Solutions

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Question : 10 of 36
Marks: +1, -0
Using Binomial Theorem, indicate which number is larger (1.1)10000(1.1)^{10000} or 1000.
Solution:  
Splitting 1.1 and using binomial theorem to write the first few terms we have (1.1)10000(1.1)^{10000} = (1+0.1)10000(1+0.1)^{10000}
= 10000C0+10000C1(0.1)\,{}^{10000}C_0+\,{}^{10000}C_1(0.1) + 10000C2(0.1)2\,{}^{10000}C_2(0.1)^2 + ... + 10000C10000(0.1)10000\,{}^{10000}C_{10000}(0.1)^{10000}
= 1 + 10000 × 110\frac{1}{10} + some positive terms
= 1 + 1000 + some positive terms > 1000.
Hence, (1.1)10000(1.1)^{10000} is larger than 1000.
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