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प्रश्न
If `[(a,c,0),(b,d,0),(0,0,5)]` is a scalar matrix, then the value of a + 2b + 3c + 4d is ______.
पर्याय
0
5
10
25
MCQ
रिकाम्या जागा भरा
उत्तर
If `[(a,c,0),(b,d,0),(0,0,5)]` is a scalar matrix, then the value of a + 2b + 3c + 4d is 25.
Explanation:
In scalar matrix all diagonal elements are equal so,
a = d = 5
c = b = 0
value of a + 2b + 3c + 4d
= 5 + 20
= 25
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