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Since 1+99=100. And 2+98=100 and 3+97=100 etc to 49+51=100 it's 49 of those plus 50 or 4,950. The sum of the first 99 whole numbers is 4,950

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โˆ™ 2012-09-16 16:12:50
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Q: What is the unit digit in the sum of first 99 whole numbers?
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