MCQ
The positive integer just greater than $(1+0.0001)^{10000}$ is:
  • A
    4
  • B
    5
  • C
    2
  • 3

Answer

Correct option: D.
3
  1. 3
Solution:
$(1+0.0001)^{10000}$
$=\big(1+\frac{1}{10000}\big)^{10000}$
$=\big(1+\frac{1}{\text{n}}\big)^{\text{n}}=\text{n}\text{c}_{0}(1)^{\text{n}}+\text{n}\text{c}_{1}(1)^{\text{n}-1}\cdot\frac{1}{\text{n}}+\text{n}\text{c}_{2}(1)^{\text{n}-2}\frac{1}{\text{n}^{2}}+\ ....$
$=1+\text{n}\cdot\frac{1}{\text{n}}+\frac{\text{n}(\text{n}-1)}{2}\cdot\frac{1}{\text{n}^2}+\ ....$
$=2+\frac{\text{n}(\text{n}-1)}{2\text{n}^{2}}+\ ....$ > 2 Integer just greater than 2 is 3.

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