Question

If 1 by 6! + 1 by7! = X by 8! Find x

Answer 1

Step-by-step explanation:

1/6. /1/7=x/8

7+6/42=x/8

13/42=x/8

13×8=42×x

102=42x

x=102/42

x=2.42

Answer 2

Answer:-

=> 1/6! + 1/7! = x/8!

=>$\frac{1}{6\times5\times4 \times3\times2\times1} + \frac{1}{7\times6\times5 \times4\times3\times2\times1} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{x}{8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1}$

$=> \frac{1}{720} + \frac{1}{5040} = \frac{x}{40320}$

$= > \frac{5040 + 720}{3628800} = \frac{x}{40320}$

$= > \frac{5760}{3628800} = \frac{x}{40320}$

$= > \frac{5760 \times 40320}{3628800} = x$

$= > x = \frac{232243200}{3628800}$

$= > x = 64$