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Explain how to calculate 75 + 72 + 69 + 66 + .... + 21 + 18 + 15 + ... + (-69) + (-72) + (-75) without a calculator.

 Aug 31, 2022
 #1
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That's pretty easy, are you sure you need help with that, all the numbers cancel each other out.

 Aug 31, 2022

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