Find the sum of each arithmetic sequence 1. 5, 8, 11, 14,...a20 Sn=__________2. 3, 7, 11, 15,...a16. Sn=__________ 3. 2, 7, 12, 17,...a23. Sn=__________4. -15, -10, -5, 0,...a16. Sn=__________5. -11, -12, -31, -41,...a15. Sn=________

Question

Find the sum of each arithmetic sequence 1. 5, 8, 11, 14,...a20    Sn=__________2. 3, 7, 11, 15,...a16.    Sn=__________ 3. 2, 7, 12, 17,...a23.   Sn=__________4. -15, -10, -5, 0,...a16. Sn=__________5. -11, -12, -31, -41,...a15.   Sn=________​

depioxianlem · Answer

Answer:Formula: Sn = n ÷ 2 [ 2a1 + (n -1) d ]1. Sn = 6702. Sn = 5283. Sn = 13114. Sn = 3605. Sn = - 1215

Find the sum of each arithmetic sequence 1. 5, 8, 11, 14,...a20 Sn=2. 3, 7, 11, 15,...a16. Sn= 3. 2, 7, 12, 17,...a23. Sn=4. -15, -10, -5, 0,...a16. Sn=5. -11, -12, -31, -41,...a15. Sn=

Answer (1)

Find the sum of each arithmetic sequence 1. 5, 8, 11, 14,...a20 Sn=__________2. 3, 7, 11, 15,...a16. Sn=__________ 3. 2, 7, 12, 17,...a23. Sn=__________4. -15, -10, -5, 0,...a16. Sn=__________5. -11, -12, -31, -41,...a15. Sn=________​

Answer (1)

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