Mathematical Reasoning and Aptitude
5.5
Alternatively
:
The series is 1
2
−
1, 2
2
−
2, 3
2
−
3, 4
2
−
4,
5
2
−
5, 6
2
−
6, 7
2
−
7, 8
2
−
8 and so on.
Therefore, (c) is the correct answer.
N
3
Series
Example 14:
1, 8, 27, 64, 125, 216, …
(a) 256
(b) 343
(c) 365
(d) 400
Solution:
The series is 1
3
, 2
3
, 3
3
, etc. The missing number
is 7
3
=
343.
Therefore, (b) is the correct answer.
N
3
+
1 Series
Example 15:
2, 9, 28, 65, 126, 217, 344, …
(a) 513
(b) 362
(c) 369
(d) 361
Solution:
The series is 1
3
+
1, 2
3
+
1, 3
3
+
1 and so on.
Thus, the missing number is 8
3
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