Let {N1(t ), t ≥ 0} and {N2(t ), t ≥ 0} be independent renewal processes. Let N(t) = N1(t) +N2(t).

(a) Are the interarrival times of {N(t), t ≥ 0} independent?

(b) Are they identically distributed?

(c) Is {N(t), t ≥ 0} a renewal process?