Jamb Mathematics Questions - Progression
Question 16:
The sum of the first two terms of a geometric progression is x and sum of the last terms is y. If there are n terms in all, then the common ratio is
- A \(\frac{x}{y}\)
- B \(\frac{y}{x}\)
- C (\(\frac{x}{y}\))<sup style='font-size: smaller;'>\(\frac{1}{n - 2}\)</sup>
- D (\(\frac{y}{x}\))<sup style='font-size: smaller;'>\(\frac{1}{n - 2}\)</sup>
Question 18:
Find the sum of the first twenty terms of the progression log a, log a2, log a3.....
- A Log a<sup style='font-size: smaller;'>20</sup>
- B Log a<sup style='font-size: smaller;'>21</sup>
- C Log a<sup style='font-size: smaller;'>200</sup>
- D Log a<sup style='font-size: smaller;'>210</sup>
Question 19:
Find the sum of the first 18 terms of the progression 3, 6, 12......
- A 3(2<sup style='font-size: smaller;'>17</sup> - 1)
- B 3(2<sup style='font-size: smaller;'>18</sup> - 1)
- C 3(2<sup style='font-size: smaller;'>18</sup> + 1)
- D 3(2<sup style='font-size: smaller;'>17</sup> - 1)
Question 20:
What is the nth term of the progression 27, 9, 3,......?
- A 27\(\frac{1}{3}\) <sup style='font-size: smaller;'>n - 1</sup>
- B 3<sup style='font-size: smaller;'>n + 2</sup>
- C 27 + 18(n - 1)
- D 27 + 6(n - 1)