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CBSE Class 12 Math 2009 Solved Paper

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Question : 9
Total: 29
If matrix A = (1, 2, 3), write AA’, where A’ is the transpose of matrix A.
Solution:  
Given : A = [
123
]
∴ A' = [
1
2
3
]
AA' = [
123
] [
1
2
3
] = [
1×1+2×2+3×3
]
= [14]
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