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sydneyyy
What conjecture can you make about the sum of the first 10 positive even numbers? A. The sum is 9 · 10. B. The sum is 10 · 10. C. The sum is 11 · 12. D. The sum is 10 · 11.
the sum of n numbers = n(n+1)
so if n = 10 , n(n+1) = ?
thanks
yw
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