400 പേജുള്ള ഒരു ബുക്കിന്റെ പേജുകളിൽ നമ്പർ ഇടുന്നതിന് എത്ര അക്കങ്ങൾ വേണ്ടിവരും ?
A1600
B800
C900
D1092
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S, T, U, V, W and X live on six different floors of the same building. The lowermost floor in the building is numbered 1.
the floor above it is mumbered 2, and so on till the topmost floor is numbered 6.
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