Mental math - The sum of the first $50$ positive odd integers is $50^2$. Find the sum of the first $50$ positive even integers.
Find the sum of the first $50$ positive even integers
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algebra-precalculus
summation
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2Hint: each of these even integers is one bigger than one of the odd integers. – 2012-12-16
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5There are $50$ kids lined up, you give them $1$ candy, $3$, $5$, and so on. Total candies $50^2$. Now you give each kid one more. – 2012-12-16