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NDA Mathematics 16 April 2023
MCQ (Single Correct Answer)
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Let AX = B be a system of 3 linear equations with 3-unknowns. Let X1 and X2 be its two distinct solutions. If the combination aX1 + bX2 is a solution of AX = B; where a, b are real numbers, then which one of the following is correct ? 
A
a = b
B
a + b = 1
C
a + b = 0
D
a - b = 1
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