1, 5, 9, (?), 25, 37, 49.
(a) 16
(b) 17
(c) 19
(d) 20
Solution:
In this series there are two groups of numbers.
In the first group 1, 9, 25 49 and in the second group 5, (?), 37
In the first group we add 8 to the first number, then add 16 to the second number, and then add 24 to the third number.
1 + 8 = 9
9 + 16 = 25
25 + 24 = 49
In the second group;
2^2 + 1 = 5
4^2 + 1 = 17
6^2 + 1 = 37
Answer: 17
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