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$M$ is a square matrix of order $’n’$ and its determinant value is $5.$ If all the elements of $M$ are multiplied by $2,$ its determinant value becomes $40.$ The value of $’n’$ is

1. $2$
2. $3$
3. $5$
4. $4$

### 1 comment

let |A|=5  and n*n matrix

after  multiply by each term the determinent become 40 means

2^n*|A|=40

2^n*5=40

2^n=8

2^n=2^3

n=3

|A| IS 3*3 MATRIX

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