If x, y, z are in geometric progression and the expression
xb – c y c – a z a – b is equal to 1, then a, b and c are in:
Geometric progression
Arithmetic progression
Harmonic progression
None of the above
The sum of six terms of an arithmetic progression is 9 and the sum of the first 9 terms is 6. the sum of the first fifteen terms will be:
- 6
- 15
3
- 3
If x < 1, the sum of the series 1 + 2x + 3x2+ 4x3 + ….. to infinity is:
1 / (1 – x)
1/ (1 – x)2
½
2/ (1 – x )
Directions: In these questions, a series is given which may consist of number, alphabets or a mixture of both. You have to identify from the choices given against each question, the next term in the series.
3,10,29,66,127?
164
187
218
216
How many terms of the series 3, 9, 27…. Will add up to 363?
5
6
7
8
The next term in the series
13, 25, 51, 101, 203, is:
405
406
407
411
The second term of a geometric progression is 2/3 and the fifth term is 16/81. Find the seventh term.
32/729
16/512
15/524
64/729
Find the next term in the given series in each of these questions.
198, 194, 185, 169, ….
136
144
112
92
Find out the right letters for the questions marks:
A MAB N E I F J C O D P G K?
MN
LM
IE
None of these
Find the number which, when added to itself 13 times gives 112.
9
7
8
11