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Question

Period of f(x)=[x]+[2x]+[3x]+.....+[nx]n(n+1)2x,nϵN and [∙] denotes greatest integer function is

A
12
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B
1
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C
n
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D
Does not exist.
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Solution

The correct option is B 1
f(x)=[x]+[2x]+[3x]++[nx](x+2x+3x++nx)
=({x}+{2x}+{3x}+{4x}++{nx})
period of f(x)=LCM(1,12,13,1n)=1

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