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Questions  

The domain of f(x)=([x]1)+(4[x])(where [ ] represents the greatest integer function). 

a
1,5
b
(1,5)
c
1,5
d
-1,5

detailed solution

Correct option is A

Given f(x)=([x]−1)+(4−[x]) So, f(x) is defined when [x]−1≥0 and 4−[x]≥0, i.e., 1≤[x]≤4 or 1≤x<5 Hence, the domain of f(x) is Df=[1,5) .

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