Discussion
Find the one which does not belong to that group ?
Answer: B
Three of the four are perfect cubes.
\[ 343 = 7^{3}, \quad 1331 = 11^{3}, \quad 2197 = 13^{3} \]
\[ 121 = 11^{2} \text{, a square rather than a cube} \]
So 121 does not belong. It is deliberately paired with 1331, the cube of the same number 11.
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