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The following three relations are define...

The following three relations are defined on the set of natural numbers N:
R = `{(x,y): x lt y, x in N , y in N}`
S = `{(x,y) : x+y = 10 , X in N, y in N}`
T = `{(x,y) : x = y or x-y = 1, x in N , y in` N}`
explain which of the above relation are

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