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Regular expressions are used to represent which language?

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1. 
The length of the shortest string NOT in the language (over ? = {a, b}) of the following regular expression is _____________
a*b*(ba)*a*
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2.
Consider the languages L1 = and L2 = {a}. Which one of the following represents L1 L2* U L1*
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3.
Regular expression (x/y)(x/y) denotes which of the following set?
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4.
If R is regular language and Q is any language (regular/ non regular), then Pref (Q in R) is _____________
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5.
Regular expressions can be used only for values of type string and number.
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