If $1 / 4! + 1 / 5! = X / 720$ , find the value of $X$ ____.

36

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49

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32

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34

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Solution

The correct option is A $36$
Given,
$\frac{1}{4!} + \frac{1}{5!} = \frac{X}{720}$

$\to \frac{1}{24} + \frac{1}{120} = \frac{X}{720}$

$\to \frac{5 + 1}{120} = \frac{X}{720}$

$\to X = 36$

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