Write (T) for true and (F) for false against each of the following statements :
(i) If a number is divisible by 4. it must be divisible by 8 .
(ii) If a number is divisible by 8 . it must be divisible by 4 .
(iii) If a number divides the sum of two number exactly. it must exactly divide the num .bers separately.
(iv) If a number is divisible by both 9 and 10 . it must be divisible by 90.
(v) A number is divisible by 18 if it is divisible by both 3 and 6 .
(vi) If a number is divisible by 3 and 7 . it must be divisible by 21.
(vii) The sum of two consecutive odd number is always divisible by 4 .
(viii) If a number divides two number exactly. it must divide their sum exactly.