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प्रश्न
Compute the products AB and BA whichever exists in each of the following cases:
[a, b]`[[c],[d]]`+ [a, b, c, d] `[[a],[b],[c],[d]]`
उत्तर
[a b] `[[c],[d]]`+[a b c d] `[[a],[b],[c],[d]]`
`⇒ [ac+ bd]+[a^2+b^2+c^2+d^2] `
`[a^2+b^2+c^2+d^2+ac+bd]`
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