i hope you can show understanding working with correct answer

SET 1 QUESTION 3 QUESTION 1 (a) The sum of the first n terms of an arithmetic series is _ (Sn? -n). (1) Write down an expression for the sum of the first n -1 terms. [ 2 marks ] (a) State the values of p and q if A is a skew-symmetrical matrix. [ 2 marks ] (C2, CLO1, MQF LODI) (C1, CLO1, MQF LOD 1) (ii) Hence, show that the series is an arithmetic series. [ 3 marks ] (b) Given p=1 &q=-1. (C2, CLO1, MQF LODI) 1) Find the cofactor of the third row. [ 3 marks ] (C2, CLO1, MQF LOD 1) (b) The sixth term and the third term of a geometric series are - 1 and _ ii) Hence, find the determinant of matrix A. [ 2 marks ] 486 18 respectively. (C2, CLO1, MQF LOD 1) (1) Find the common ratio of the series. [ 2 marks ] 0 (C2, CLO1, MQF LODI) oniii) By using properties of determinant, find the value of |2 -1 1 -3 5 0 (ii) Determine the smallest integer value n such that