यदि `A=[(1,1,-2),(2,1,-3),(5,4,-9)]` हो तो `|A|` ज्ञात कीजिए।

Explanation

`A=[(1,1,-2),(2,1,-3),(5,4,-9)]`
`implies|A|=|(1,1,-2),(2,1,-3),(5,4,-3),(5,4,-9)|`
`=1|(1,-3),(4,-9)|-1|(2,-3),(5,-9)|+(-2)|(2,1),(5,4)|`
(`R_(1)`से विस्तार करने पर)
`=1(-9+12)-1(-18+15)-2(8-5)`
`=3+3-56=0`