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Question

Define x % a as the remainder obtained when x is divided by a.
Let f:ZR be defined as f(x)=x % k, where k ϵ N. If Y is the range of f(x), then

A
Y=R
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B
Y=[0,k]
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C
Y=N{0}
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D
n(Y)=k
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Solution

The correct option is D n(Y)=k
Given x is an integer and k is a natural number, x can be expressed as
x=q.k+r, where q,r ϵ Z and 0r<k.
i.e. the remainder can be any value from 0 to k-1
r ϵ {0,1,2.......k1}f(x) ϵ {0,1,2........k1}Y={0,1,2,..........k1}n(Y)=k

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