In each of the following questions, four words have been given, out of which three are alike in some manner and the fourth on is different. Choose out the odd one.

In each of the following question, four words have been given, out of which three are alike in some manner and the fourth on is different. Choose out the odd one.

20, 21, 19, 16, 17, 13, 14, 11, ?

380, 645, 557, 656, 762, 875, ?

If ‘+’ means ‘÷’, `-` means `×`, `÷` means `+` and `×` means `-`, then
36 × 12 + 4 ÷ 6 + 2 - 3 = ?

If 34 * 12 = 23, 28 * 76 = 52, 97 * 39 = 68 then what should 37 * 73 be ?

Direction: In the following, select the related word from the given alternatives.
Heat : Convection :: Space : ?

Direction: In the following, select the related word from the given alternatives.
Antiseptic : Germs :: Antidote : ?