Find the sum of the arithmetic sequence with first term 12 last term 90 and 14 terms
Answer (1)
Answer:Sn = n/2 * (a1 + an)S14 = 14/2 * (12 + 90)S14 = 7 * 102S14 = 716
Answer:Sn = n/2 * (a1 + an)S14 = 14/2 * (12 + 90)S14 = 7 * 102S14 = 716
