1*2*3*4*5*6*7*8*9*10 = 36288000

3*6*2*8*8 = 2304

3628800 / 2304 = 1575

3628800 / 1575 = 2304

2304 / 9 = 256

1*5*7*5 = 175

1575 / 175 = 9

362880 / 360(2) = 28

256 / 9 = 28.44444444

28.44444444 - 28 = 0.44444444

12 / 0.44444444 = 27

( 27 * 28 ) / ( 27 + 28 ) = 13.74595455

68 / 13.74595455 = 4.947089947

1 / ( 5 - 4.947089947) = 18.9

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