A child starts adding up all positive integers beginning with 1. At some point, her total is 444. Her dad realises that such a total is possible if the child has accidentally counted one of the numbers twice. What number did the child count twice?
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Answer:
9
Step-by-step explanation:
when the child reaches 29 her total is 435 then the only number that can be added again is 9 to get a sum total of 444.
PLEASE LET me know if this is correct.
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