Discussion
Find out the wrong number in the given sequence of numbers 25, 36, 49, 81, 121, 169, 225
Answer: A
The series is the squares of the odd numbers.
\[ 5^{2},\; 7^{2},\; 9^{2},\; 11^{2},\; 13^{2},\; 15^{2} = 25,\; 49,\; 81,\; 121,\; 169,\; 225 \]
\[ 36 = 6^{2}, \text{ the square of an even number} \]
So 36 is the wrong number. Being a perfect square, it fits the looser pattern - which is exactly the trap.
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