# Let A be a square matrix all of whose entries are integers. Then which one of the following is true? Option 1) If need not exist Option 2) If   exists  but all its entries are not necessarily integers Option 3) If exists and all its entries are non­integers Option 4) If exists and all its entries are integers

As we learnt in

Inverse of a matrix -

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exist and all its entries are non integers.

Option 1)

If need not exist

Incorrect Option

Option 2)

If   exists  but all its entries are not necessarily integers

Incorrect Option

Option 3)

If exists and all its entries are non­integers

Incorrect Option

Option 4)

If exists and all its entries are integers

Correct Option

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