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Question

Let A={nNn2n+10,000}, B={3k+1|kN} and C={2k|kN}. Then the sum of all the elements of the set A(BC) is equal to

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Solution

n2n100000
n(1400012,1+400012)
But nN
A={1,2,3,.......,100}
and BC={3k+1|keven}
BC={7,13,19,.......,97,..}
A(BC)={7,13,19,...,97}
Sum of all elements =162[7+97]=832

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