lf z + 1/z =1 and a = z^2017 +1/z^2017 ...

lf `z + 1/z =1 and a = z^2017 +1/z^2017 and b` is the lastdigit of the number `2^(2^n)-1` ,, when the integer `n >1`, the value of `a^2 +b^2` is

A

23

B

24

C

26

D

27

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The correct Answer is:

c

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