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The bit strings for the sets are 1111100000 and 1010101010. The union of these sets is ___________

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The bit strings for the sets are 1111100000 and 1010101010. The union of these sets is ___________

(a) 1010100000

(b) 1010101101

(c) 1111111100

(d) 1111101010

I have been asked this question at a job interview.

The doubt is from Set Operations topic in portion Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Right answer is (d) 1111101010

For explanation I would say: The bit string for the union is the bitwise OR of the bit strings.

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