17. Find the first five terms of this sequence: \small a_{n}=\frac{1}{3^{n}}. Answers A. \small \frac{1}{3},\frac{1}{9},\frac{1}{27},\frac{1}{81},\frac{1}{243} B. \small \fn_phv \small \frac{1}{3},\frac{1}{6},\frac{1}{9},\frac{1}{12},\frac{1}{15} C. \small 1,\frac{1}{3},\frac{1}{6},\frac{1}{9},\frac{1}{12} D. \small \fn_phv \small 1,\frac{1}{3},\frac{1}{9},\frac{1}{27},\frac{1}{81} Question18. Find the first term of this sequence: an = 5 - n2. Answers A. 5 B. 4 C. 3 D. 1 Question19. Find the first five terms of this sequence: an = 5 - n2. Answers A. 5, 4, 1, -4, -11 B. 4, 1, -4, -11, -20 C. 3, -1, -3, -5, -7 D. 5, 3, -1, -3, -5 Question20. Find the first term of this sequence: \small \left \{ \frac{2n-1}{n} ight \} Answers A. 0 B. 1 C. -1 D. 2 Question21. Find the first five terms of this sequence: \small \left \{ \frac{2n-1}{n} ight \}. Answers A. 0, 1, 2, 3, 4 B. \small 2,\frac{5}{2},\frac{8}{3},\frac{11}{4},\frac{14}{5} C. \small -1,1,\frac{3}{2},\frac{5}{3},\frac{7}{4} D. \small 1,\frac{3}{2},\frac{5}{3},\frac{7}{4},\frac{9}{5}