Q.20-let (a,} be a decreasing sequence of non- negative real numbers such that lim inf(na,) = 0 then which of the following must be true? (a) lim(na,) = 0 as n

Q.20-Let (a,} be a decreasing sequence of non- negative real numbers such that lim inf(na,) = 0 Then which of the following must be TRUE? (a) lim(na,) = 0 as n (b) lim(na,) = 1,1>0 asn~o (C) lim(na,) = oo as n co (d) None of these