In each of the following parts, you are provided a sequence a1; a2; a3; of numbers and a value for n. find the sum of the rst n terms in the sequence. if the sum of all terms in the sequence, i. e., an in nite sum, exists, specify this sum. (a) the sequence a1; a2; a3; is given by 14; 7; 3: 5; 1: 75; and n = 20, (b) the sequence a1; a2; a3; is given by 14; 28j; ; ; and n = 20,in each of the following parts, you are provided a sequence a1; a2; a3; of numbers and a value for n. find the sum of the rst n terms in the sequence. if the sum of all terms in the sequence, i. e., an in nite sum, exists, specify this sum. (a) the sequence a1; a2; a3; is given by 14; 7; 3: 5; 1: 75; and n = 20, (b) the sequence a1; a2; a3; is given by 14; 28j; ; ; and n = 20,