JEE Advanced 2020 Concept Recapitulation Test 1 Paper 2

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Question : 37 of 54

Marks: +1, -0

If 1,α1,α2,α3,α4 are the fifth roots of unity then

4

∑

r=1

‌

1

2−αr

=

‌
51
31
‌
49
31
‌
25
32
‌
25
16

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