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Question

If L1, L2 are regular and op(L1, L2) is also regular, then L1 and L2 are said to be ____________ under an operation op.

a.

open

b.

closed

c.

decidable

d.

none of the mentioned

Answer: (b).closed

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Q. If L1, L2 are regular and op(L1, L2) is also regular, then L1 and L2 are said to be ____________ under an operation op.

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