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E. Find the indicated sum: 1. 2, 4, 6, 8, 2. 1, 3, 9, 27, ... 3. a = 5; d=4 4. aj = 2; r= 2 1 1 1 1 5. 3 6 9 12 S10= Ss S9 S10 = S8 = - ..​