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  4. Let A= n ∈ N: H.C.F. (n, 45)=1 and Let B= 2 k: k ∈ 1,2, ldots, 100 . Then the sum of all the elements of A ∩ B is

Q. Let H.C.F. and Let . Then the sum of all the elements of is ____

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1. Which of the following sets are disjoint? \begin{array}{l} A=\{\text { Multiples of } 3\} \\ B=\{\text { Multiples of } 5\} \\ C=\{\text { Multiples of } 7\} \end{array}

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