Question

If 1/7! + 1/8! =A/9! then find the value of A.
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Answer 1

Answer:

81 because LHS is equal to RHS ...So A is equal to 81

Answer 2

Answer:

$\bf\huge\red{answer: \implies \: A = 80}$

step by step explain

$\frac{1}{7!} + \frac{1}{8!} = \frac{A}{9!} \\ \\ \implies \: 9!( \frac{1}{7!} + \frac{1}{8!} ) =A \\ \\ \implies \frac{9!}{7!} + \frac{9!}{8!} =A \\ \\ \implies \frac{9 \times 8 \times \cancel{7!}}{ \cancel{7!}} + \frac{9 \times \cancel{8!}}{ \cancel{8!}} = A \\ \\ \implies9 \times8 + 8 = A \\ \\ \implies \: A = 80$