Maths-

General

Easy

Question

# If A = and A^{–1} = then value of a and c is -

- 1,1
- 1, – 1
- 1,2
- – 1,1

## The correct answer is: 1, – 1

### I = AA^{–1} =

=

comparing the elements of AA^{–1} with those of I,

c + 1 = 0 c = –1

and a – 1 = 0 a = 1

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