JEE Advanced Mathematics question

In each question, match every entry of Column I with the correct entry of Column II. (An entry of Column II may be used more than once.) Column I: (i) If is a nonreal root of then is equal to (ii) The order of the differential equation whose general solution is , where are arbitrary constants and are fixed constants, is (iii) Let and . If then is (iv) If are three mutually perpendicular vectors where then is Column II: (a) (b) (c) (d)

• (1)(i)-(d), (ii)-(b), (iii)-(a), (iv)-(c)
• (2)(i)-(b), (ii)-(a), (iii)-(d), (iv)-(c)
• (3)(i)-(a), (ii)-(d), (iii)-(b), (iv)-(c)
• (4)(i)-(d), (ii)-(a), (iii)-(b), (iv)-(c)Correct