যদি x = 2 + 5i যেখানে i = \(\sqrt{-1}\) এবং 2\(\left(\frac{1}{1!9!}+\frac{1}{3!7!}\right)\) + \(\frac{1}{5!5!}\) = \(\frac{2^a}{b!}\) হয়, তাহলে (x3 - 5x2 + 33x - 19) এর মান কত?

1
a - b
2
a + b
3
a
4
b

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