ITS A 7 LETTER WORD.
IF WE REMOVE 1 LETTER FROM IT, IT REMAINS SAME.
IF WE REMOVE 2 LETTERS FROM IT, IT REMAINS SAME.
IF WE REMOVE 3 LETTERS FROM IT, IT REMAINS SAME.
IF WE REMOVE ALL THE LETTERS FROM IT, STILL IT REMAINS SAME.
WHAT is IT ?
Ans: POSTBOX
