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The no of elements which do not have complements in the above lattices is __________

• $0^{-1}$ = 1
• $1^{-1}$ = 0
• $a^{-1}$ = b
• $b^{-1}$ = a

Other than this 4 elements no other element has complements.

Total number of elements = 10

Number of elements that has no complement = 10 – 4 = 6.

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