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Let A={n in N : n is a 3- digit nu...

Let ` A={n in N : ` n is a 3- digit number }
` B={ 9k +2 : k in N}`
and ` C= { 9k +l : K in N }` for some `l (0 lt l lt 9) ` if the sum of all the elements of the set `A nn (B uu C) ` is `274 xx 400` , then l is equal to ______.

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