The earth's vital signs reveal a patient in declining health. (Change the Voice.)
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We know the formula to find the sum of first n terms of an Arithmetic Progression is S = n2[2a + (n - 1)d]. In the formula there are four quantities. They are S, a, n and d. If any three quantities are known, the fourth quantity can be determined.
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sorry yarr I don't know the answer
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