MCQ
The number of binary operation that can be defined on a set of $2$ elements is:
- A$8$
- B$4$
- ✓$16$
- D$64$
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$12 \int \limits_{3}^{b} \frac{1}{\left(x^{2}-1\right)\left(x^{2}-4\right)} d x=\log _{e}\left(\frac{49}{40}\right)$, is equal to