A few days ago
Geometry Help!!!!!?
Question 1
It took Tom ten seconds to sum the integers from 1 to 100. Now it’s your turn. find a fast way to sum the integers from 1 to 100; from 1 to n.
Thank you for your help.
Top 1 Answers
A few days ago
Favorite Answer
Consider 100 + 1, then 99 + 2, 98 + 3, and so on. That’s 101 fifty times. 101 * 50 = 5050.
In general, if n is even, then consider n + 1. Multiply (n + 1) by n/2
If n is odd, then consider n + 1. Multiply (n + 1) by (n – 1)/2. Then add (n + 1)/2.
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