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For an identity matrix I_n, the element a_{ij} equals
Aalways 1
Balways 0
Ci + j
D1 if i = j, 0 otherwise
Answer & Solution
Correct answer: D. 1 if i = j, 0 otherwise
1. The identity matrix has 1's on the main diagonal and 0's elsewhere.
2. In subscript form a_{ij} = 1 when i = j and 0 when i ≠ j.
3. This is the Kronecker delta definition.
_Source: Maharashtra Balbharati Std XII Mathematics Part 1, Ch 2 "Matrices" §2.3_
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