Date | May 2017 | Marks available | 2 | Reference code | 17M.1.SL.TZ1.T_10 |
Level | Standard Level | Paper | Paper 1 (with calculator from previous syllabus) | Time zone | Time zone 1 |
Command term | Find | Question number | T_10 | Adapted from | N/A |
Question
The first three terms of a geometric sequence are .
Find the value of , the common ratio of the sequence.
Find the value of for which .
Find the sum of the first 30 terms of the sequence.
Markscheme
* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.
OR (M1)
Note: Award (M1) for dividing any by .
(A1) (C2)
[2 marks]
(M1)
Note: Award (M1) for their correct substitution into geometric sequence formula.
(A1)(ft) (C2)
Note: Follow through from part (a).
Award (A1)(A0) for or with or without working.
[2 marks]
(M1)
Note: Award (M1) for correct substitution into geometric series formula.
(A1)(ft) (C2)
[2 marks]