Question

Find x, if:
$\frac{1}{4!}-\frac{1}{x!}=\frac{4}{5!}$

Answer 1

Solution :

1/4! - 1/x! = 4/5!

=> 1/4! - 4/5! = 1/x!

=> 5/( 5 × 4! ) - 4/5! = 1/x!

=> 5/5! - 4/5! = 1/x!

=> 1/5! = 1/x!

Therefore ,

x = 5

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