Which of the following identity is true?

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answerhappygod
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Which of the following identity is true?

Post by answerhappygod »

a) Ɛ + RR* = R* = ɛ + R*R
b) (R1R2)*R1 = R1 (R2R1)*
c) R*R* = R*
d) All of the mentioned
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