9.27.81. (), (), (). 7.13.19. (), (), (), 43. (). 1.2.6.24. (), (), ()

9,27,81,243,729,2187；
7,13,19,25,31,37,43,49；
1,2,6,24,120,720,5040；

Six out of eleven times ten out of fifteen, nineteen out of one hundred times three out of eight times fifty

6/11×10/15
=6/11×2/3
=4/11
19/100×3/8×50
=19/100×50×3/8
=19/2×3/8
=57/16
=3 and 9 / 16

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