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You can use the formula for the sum of an arithmetic series to calculate that quickly. (Of course, you can also type the numbers into Excel, and get the sum - but that doesn't scale well - e.g., it won't work well if you are then asked, for instance, to get the sum of the first million even numbers.)
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Earn +20 ptsQ: What is the sum of the fist 40 even numbers?
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Continue Learning about Math & Arithmetic
What are three even consecutive numbers whose sum is 120?
The numbers are 38, 40 and 42.
What is sum of first 40 numbers?
The sum of the first 40 whole numbers is 780.
Find the sum of first 20 even numbers. sum?
The sum of the first 20 even numbers... is 110
What is the sum of the first 20 even numbers?
2+4+6+8+10........+40=420
What two numbers have the sum of 40 and the difference of 10?
The numbers are 25 and 15
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