When asked to find the sum of numbers from 1 to 70, should we add 1 and 70 as well or only the numbers in between?
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we should add 1 and 70 as well as the numbers between them
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Answer:
It is easy to see that we are taking alternate terms in 1 to 70. So there are 35 even numbers. Hence their sum using the same formula is S = (35/2)(2+70) = 1260.
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