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JEE Mains 2017 - Matrix and Determinant Previous Year Questions with Solution (in Hindi)
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Important lesson for JEE Mains exam. Because every year at least two questions in exam from Matrix and Determinant chapter.

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Deepankar Singh
a year ago
sure Vani. :) thank you for the feedback.
how value of umega square is acting as conjugate in 2nd question
Sir is question me simple tarike se nhi kr sakte jaise 3A square and 12A Square nikalne ke baad kre fir uska adjoint nikale but aise answer nhi aa rha
sir plz differential equation ka banaiye na
sorry 12A hai square nhi sir
N
I need matrix questions
1. 2 -3 If A= then adj (3A2 12A) is equal to JEE MAINS 2017 72-84 (1)-63 51 51 63 (2) 84 72 51 84 63 72 72 -63 (4) -84 51 342-9A = 301 2 3 -4 1 Sol. A= 342 + 12A = 301 + 21 A 2- -3 30 0 0 308421 72 -63 -84 51 42 -63 IA-All = f(A) 2-32-10 51 63 .. A satisfies f(X) adj(3A2 +12A) = 84 72 A2-3A-10/ = 0 Answer (2)

2. Let be a complex number such that 2 + 1 = z where z=V-3 . If MAINS 2017 11 1 -of-1 of JEE 3k, then k is equal to (4) 1 C0 2 Sol. 2() + 1 = z , z = V3i Cube root of unity 2 1-1-0,-0) 3V3i =11 10 k =-z

3. If S is the set of distinct values of b for which the following system of linear equations x + y + z = 1 (1) An empty set (2) An infinite set ax + by + z = 0 has no solution, then s is (3) A finite set containing two or more elements (4) A singleton JEE MAINS x + ay + z = 1 2017 -(1-a)2-0 a-1 For a = 1 Eq (1) & (2) are identical ie., x y + z = 1 To have no solution with x + by + z = 0 x+y+z=1 x + ay + z = 1 Sol. (ii) (iii) ax + by + z 0 D=0 Answer (4)