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Directions: In each of the following number series, two terms have been put within brackets. Mark your answer as (a) If both the bracketed terms are right; (b) If the first bracketed term is right and second is wrong; (c) If the first bracketed term is wrong and second is right; and (d) If both the bracketed terms are wrong.


[M.A.T. 2005]
(2), 5, (12), 25, 41, 61
Options:
A .  If both the bracketed terms are right
B .  If the first bracketed term is right and second is wrong
C .  If the first bracketed term is wrong and second is right
D .  If both the bracketed terms are wrong
Answer: Option D
Answer: (d)
The correct pattern is +4, +18, +12, +16, +20.
Clearly, 2 is wrong and must be replaced by (5 - 1)
i.e. 4. Also, 12 is wrong and must be replaced by (5 + 8)
i.e. 13.

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