Question: gamma incomplete function calculation

Hi,

I have this equation:

gammainc(5,x) = pf

pf = [24*10^-4    120*10^-4    24*10^-3    120*10^-3    24*10^-2    120*10^-2    24*10^-1    120*10^-1    24*10^0]how to find the values of x for the corressponding pf?

Thank you

Jamal

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