(4/9) do potegi 7 : ( 2/9) do potegi 8 - to trzeba obliczyc sprytnie
(1 4/9)do potegi 5 : (4 1/3) do potegi 4 - to tez sprytnie
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a) ...=(4/7)do7 * (9/2)do7*9/2=(4/9*9/2! skróć !)do7*9/2=2do7*9/2=2do6*2*9/2!skróć!=2do6*9=64*9=576
b) ...=(13/9)do5*(3/13)do4=13/9*(13/9*3/13!skróć!)do4=13/9*(1/3)do4=13/9*1/81=13/729