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Let the relation R in the set A={x in Z:...

Let the relation R in the set `A={x in Z:0<=x<=12}`,given by `R={(a,b):abs(a-b)` is a multiple of 4}` .Then [1], the ` equivalence` class `containing` `1` is`
`
a)` {1,5,9},
b) `{0,1,2,5}`
c) `phi`
d) `A`

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