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Question
What number should come next?
225, 196, 169, __, 121, 100, 81
Options:
A .  156
B .  144
C .  136
D .  125
E .  123
Answer: Option B


The given numbers are squares of consecutive natural numbers in decreasing order starting with 15, i.e. the numbers 225, 196, 169, __, 100, 81 can be written as 152, 142, 132, __, 112, 102, 92.Hence, the missing number is 122, i.e, 144.



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