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An A.p Sn = N(N+2), then findthe nth term. |
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Answer» Step-by-step explanation:The sum of the first n TERMS of a sequence is given by Sn = n(n+2). Can you find the first three terms of the sequence? Start with S1 = 1*(1+2) = 1*3 = 3. So the first term is 3. Next, S2 = 2(2+2) = 2*4 = 8. This the sum of the first two terms. Since the first term is 3, the second term is 8–3 = 5. Next, S3 = 3(3+2) = 3*5 = 15. This the sum of the first three terms. Since the sum of the first two terms is 8, the THIRD term is 15–8 = 7. Hence the first three terms are: 3, 5, and 7. |
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