Giuseppe adds all but one of the first 15 positive integers. His sum is a square of the excluded number. Which number did Giuseppe not include?
Let me correct the question first:
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Giuseppe adds all but one of the first 20 positive integers. His sum is a square of the excluded number. Which number did Giuseppe not include?
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The sum = 10.5 * 20 = 210
210 - 14 = 196
142 = 196
