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Fourth Root of Unity
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If A and H are arithmetic and harmonic mean between 2 and 3, then A + H =
49/20
49/10
49/5
32/4
In 30 minutes, hours hand of a clock turns through
π/12 radians
π/6 radians
π/24 radians
π radians
For any non- singular matrix A, A-1 =
adj A⁄|A|
1 /|A|adj A
|A|adj A
None of above
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