# Regular expression for the language of even length strings starting with a and ending with b

**Accepted Strings: **

All strings of the following pattern should be accepted by RE.

ab, aab, abb,abab,……

**Reject strings:**

All strings of the following pattern should be rejected by RE.

a, b, ba, aa, bb, ba,bba,……

**R.E =** a (aa+bb+ab+ba)* b

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