Discussion
Insert the missing number 1, 8, 27, 64, 125, 216, (....)
Answer: B
The series is the cubes of the natural numbers.
\[ 1^{3},\; 2^{3},\; 3^{3},\; 4^{3},\; 5^{3},\; 6^{3} = 1,\; 8,\; 27,\; 64,\; 125,\; 216 \]
\[ \text{next} = 7^{3} = \mathbf{343} \]
The distractor 392 is \( 216 + 176 \), continuing the differences by eye rather than recognising the cubes.
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