The sum of all the natural numbers for which $log_{(4-x)}(x^2 -14x + 45)$ is defined is -
The sum of all the natural numbers for which $log_{(4-x)}(x^2 -14x + 45)$ is defined is -
- A
$1$
- B
$2$
- C
$3$
- D
$4$
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$\log ab - \log |b| = $
$\log ab - \log |b| = $
The number ${\log _2}7$ is
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- [IIT 1990]
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The sum $\sum \limits_{n=1}^{\infty} \frac{2 n^2+3 n+4}{(2 n) !}$ is equal to :
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- [JEE MAIN 2023]