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प्रश्न
If A = `[(1, 2, 1), (3, 2, 3), (2, 1, 2)]`, then `a_11A_11 + a_21A_21 + a_31A_31` = ______
पर्याय
1
2
|A|
3
MCQ
रिकाम्या जागा भरा
उत्तर
If A = `[(1, 2, 1), (3, 2, 3), (2, 1, 2)]`, then `a_11A_11 + a_21A_21 + a_31A_31` = |A|
Explanation:
`a_11A_11 + a_21A_21 + a_31A_31`
= 1(4 - 3) + 3[-1(4 - 1)] + 2(6 - 2) = 0
and |A| = 1(4 - 3) - 2(6 - 6) + 1(3 - 4) = 0
∴ `a_11A_11 + a_21A_21 + a_31A_31` = |A|
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