Discussion
Find the missing number in the series:
121, 144, 169, ?
Answer: B
Correct answer: 196
Each term is a perfect square of consecutive whole numbers: \[ 11^2 = 121,\quad 12^2 = 144,\quad 13^2 = 169 \] so the next is \( 14^2 = \mathbf{196} \).
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