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If 1,z1, z2,ddotz(19) are the 20th roots...

If `1,z_1, z_2,ddotz_(19)` are the 20th roots of unity then `(1-z_1)(1-z_2)(1-z_3)...(1-z_(19))=` 0 2. 19 3. 20 4. 1 5. 10

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