Question
In the following question, if one term in the number series is wrong, find out the wrong term.
1, 3, 12, 25, 48
A. 25
B. 48
C. 1
D. 3
Answer: A. 25
Solution:
The term of the series is
(12-02) = 1,
(22-12) = 3,
(42-22) = 12,
(62-32) = 27,
(82-42) = 48.
So, 25 is wrong and Must be replaced by (62-32)= 27.
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Which of the following is a common factor of both x^2 – 4x – 5 and x^2 – 6x – 7?