Aai it 2018

Question

Comments

there is no need of image, you can type the question...So, first edit your question....

it is not divide operator, it is | symbol, which is used in the meaning of "or" in TOC.

===> L(r) | L(s) = L(r) ∪ L(s)

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Option 3 is correct ????  Plz check

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option c is correct

let r = 0* and s = 1*

L(r) = {∈,0,00,000,.....}

L(s) = {∈,1,11,111,1111,.....}

r . s = 0* 1* = {∈,0,00,000,.... 1,11,111,1111,.... 01,011,0111,... 001,0011,00111,......}

what is L(r) . L(s) = {∈,0,00,000,.....}. {∈,1,11,111,1111,.....} = {∈,0,00,000,.... 1,11,111,1111,.... 01,011,0111,... 001,0011,00111,......} = r . s

Answer 1

r+s will represent L(r)UL(s)

Comments

this is not required , does l(r)/l(s) represent l(R)Ul(S)?

Answer 2

@shekhar see this link https://www.tutorialspoint.com/compiler_design/compiler_design_regular_expressions.htm