. let x, =(0,1) nq and x, =ex,jq =2',ien then. (a) x, is countable but |0,1]-x, is uncountable. (b) xis countable but |0,1-x, is uncountable. (c) x, is countabl

. Let X, =(0,1) nQ and X, =eX,jq =2',ieN then. (a) X, is countable but |0,1]-X, is uncountable. (b) Xis countable but |0,1-X, is uncountable. (c) X, is countable but X, is uncountable. (d) X, is uncountable but X, is countable.