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3. Which of the following is the common factor of: 5xy, 3pqr and 40 xyz? (a) 5 (b) 0 (c) xy (d) 1

6. Which of the following are the factors of a2 + ab + bc + ca (a) ab – a – b + 1 = (1 – a)(1 – b) (b) ab – a – b + 1 = (a – 1)(b – 1) (c) ab – a – b + 1 = (1 – a)(b – 1) (d) ab – a – b + 1 = (a – 1)(1 – b)

7. Which of the following are the factors of a2 + ab +bc + ca (a) (b + c) (c + a) (b) (a + b) (a + c) (c) a(a + b + c) (d) (a + b) (b + c)

11. Factorise : 6xy – 4y + 6 – 9x. a. (2y – 3) b. (3x – 2) c. (3x – 2) (2y – 3) d. (2x – 3) (3y – 2)

13. When we factorise an expression, we write it as a ________ of factors. a. None of these b. sum c. product d. difference

14. Find and correct the errors in the following mathematical statements. 4 (x – 5) = 4x – 5 a. 4 (x – 5) = 4x – 20 b. None of these c. 4 (x – 5) = 4x – 16 d. 4 (x – 5) = 4x – 24

15. Divide as directed: 26xy (x + 5) (y – 4) ÷ 13x (y – 4) a. (x + 5) b. 2y (x + 5) c. 2y d. None of these