Engineering Mathematics Miscellaneous
- A is a 3 × 4 real matrix and Ax = b is an inconsistent system of equations. The highest possible rank of A is
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C = [A: B]3 × 5
∴ ρ [C3 × 5 ] <e; min [3,5}
Since the system is inconsistent
ρ(A) < ρ(C)
∴ ρ (A) < 3
Hence, the maximum possible rank of A = 2Correct Option: C
C = [A: B]3 × 5
∴ ρ [C3 × 5 ] <e; min [3,5}
Since the system is inconsistent
ρ(A) < ρ(C)
∴ ρ (A) < 3
Hence, the maximum possible rank of A = 2
- Consider the system of simultaneous equations
x + 2y + z = 6
2x + y + 2z = 6
x + y + z = 5
This system has
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Given equations are
x + 2y + z = 6
2x + y + 2z = 6
x + y + z = 5
Given system can be written as
Applying row operation
R2 → R2 – 2R1, R3 → R3 – R1
and applying R3 → 3R3 – R1
Since the rank of co-efficient matrix is 2 and rank of argument matrix is 3, which is not equal. Hence system has no solution.Correct Option: C
Given equations are
x + 2y + z = 6
2x + y + 2z = 6
x + y + z = 5
Given system can be written as
Applying row operation
R2 → R2 – 2R1, R3 → R3 – R1
and applying R3 → 3R3 – R1
Since the rank of co-efficient matrix is 2 and rank of argument matrix is 3, which is not equal. Hence system has no solution.
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If then det(A–1) is _________. (correct to two decimal places).
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|A| = 4
= 4|A–1| = 1 = 1 = 0.25 |A| 4 Correct Option: D
|A| = 4
= 4|A–1| = 1 = 1 = 0.25 |A| 4
- The determinant of a 2 × 2 matrix is 50. If one eigenvalue of the matrix is 10, the other eigen value is ________.
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The product of eigen value of any matrix is equal to the determinant value of the matrix λ1 = 10 , λ2 = unknown
|A| = 50
λ1 .λ2 = 50
10(λ2) = 50
∴ λ2 = 5Correct Option: B
The product of eigen value of any matrix is equal to the determinant value of the matrix λ1 = 10 , λ2 = unknown
|A| = 50
λ1 .λ2 = 50
10(λ2) = 50
∴ λ2 = 5
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For given matrix P = 4 + 3i -i where i = √-1, the inverse of matrix P is i 4 - 3i
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P = 4 + 3i -i i 4 - 3i P-1 = 4 - 3i -(-i) -i 4 + 3i | A | = 1 4 - 3i i 24 -i 4 + 3i
Correct Option: A
P = 4 + 3i -i i 4 - 3i P-1 = 4 - 3i -(-i) -i 4 + 3i | A | = 1 4 - 3i i 24 -i 4 + 3i