Question

1. Space 2. ∅ 3. ↔ LM 4. plane p 5. None of these

Answer 1

De Morgan's law: (A∩B)' = A'∪B'

(S₁∩P)' = S'₁ ∪ P'

S'₁={P} ∪ {S₂}
P' ={ S₁} ∪ {S₂}

S'₁ ∪ P'  ={P} ∪ {S₂} ∪ { S₁} ∪ {S₂}

(S₁∩P)' = S'₁ ∪ P' = SPACE