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7. [-/3 Points] DETAILS COHENPCALC7 14.4.010. MY NOTES The fifth term in an arithmetic sequence is 1/2, and the 20th term is 1. Find the

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7. [-/3 Points] DETAILS COHENPCALC7 14.4.010. MY NOTES The fifth term in an arithmetic sequence is 1/2, and the 20th term is 1. Find the first three terms of the sequence. a, = 23 Need Help? Read It10. [-/1 Points] DETAILS COHENPCALC7 14.4.014. Find the sum of the first 18 terms in the sequence 9, 14, 19, 24,.... Need Help? Read It16. [-/1 Points] DETAILS COHENPCALC7 14.4.022. MY NO The fifth and 50th terms of an arithmetic sequence are 2 and 11, respectively. Find the sum of the first 10 terms. Need Help? Read It Submit

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