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Let x be the number of 5 digit numbers sum of whose digits is even and y be the number of 5 digit numbers
sum of whose digits is odd, then
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Correct option is A
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A teacher takes three children from her class to a zoo at a time, but she does not take the same three children to the zoo more than once. She finds that she went to the zoo 84 times more than a particular child has gone to the zoo. The number of children in her class is
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