15. the leading coeficient of the polynomial 2 +3x- 4x2 +x is: (a) 1 (b)-4 (c) 2 (d) none of these 16. let g be a group. then choose the correct statement (a) a

15. The leading coeficient of the polynomial 2 +3x- 4x2 +x is: (A) 1 (B)-4 (C) 2 (D) None of these 16. Let G be a group. Then choose the correct statement (A) Aul (G) is a group (B) Inn (G) is a group (C) Both (A) and (B) (D) None of these 17. Choose the incorrect statement: (A) Every unique factorization domain is a Euclidean domain. (B) Every Euclidean domain is a principal ideal domain. (C) Every Euclidean domain is a unique factorization domain. (D) None of these 18. Let F be a field of order 8. Then characteristic of F is ... (A) 2 (B) 3 C) 0 (D) None of these 19. The quotient field of the integral domain Z of integers is the field of: (A) complex numbers (B) rational numbers (C) real numbers (D) None of these 20. Let F be a field. Then which is not correct? (A) F x] is a field (B) F ] is a ring (C) Fx is an integral domain (D) None of these