@Kabir5454 Google should help :)

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Which of the following is/are Regular?

A] $\left \{ XWYW^{R} \space\ | \space\ W,X,Y \in \left \{ a,b \right \}^{+} \right \}$

B] $\left \{ WXW^{R}Y \space\ | \space\ W,X,Y \in \left \{ a,b \right \}^{+} \right \}$

C] $\left \{ WXYW^{R} \space\ | \space\ W,X,Y \in \left \{ a,b \right \}^{+} \right \}$

D] None

R => Reverse

Please describe your answer.

A] $\left \{ XWYW^{R} \space\ | \space\ W,X,Y \in \left \{ a,b \right \}^{+} \right \}$

B] $\left \{ WXW^{R}Y \space\ | \space\ W,X,Y \in \left \{ a,b \right \}^{+} \right \}$

C] $\left \{ WXYW^{R} \space\ | \space\ W,X,Y \in \left \{ a,b \right \}^{+} \right \}$

D] None

R => Reverse

Please describe your answer.