Let aᵢ=...,-2,-1,0,1,...,i. Find the union and intersection of all aᵢ for every positive integer i.
a)ᵢ_=₁⋃[infinity]aᵢ=...,ᵢ_=₁⋂[infinity]aᵢ=-2,-1,0,1
b)ᵢ_=₁⋃[infinity]aᵢ=...,ᵢ_=₁⋂[infinity]aᵢ=-2,-1,0,1,...
c)ᵢ_=₁⋃[infinity]aᵢ=...,ᵢ_=₁⋂[infinity]aᵢ=∅
d)ᵢ_=₁⋃[infinity]aᵢ=-2,-1,0,1,..., ᵢ_=₁⋂aᵢ=∅