Discussion
Find out the wrong number in the given sequence of numbers 1, 8, 27, 64, 124, 216, 343
Answer: D
The series is the cubes of the natural numbers.
\[ 1^{3},\; 2^{3},\; 3^{3},\; 4^{3},\; 5^{3},\; 6^{3},\; 7^{3} = 1,\; 8,\; 27,\; 64,\; 125,\; 216,\; 343 \]
The fifth term should be \( 5^{3} = 125 \), not 124.
So 124 is wrong - off by exactly one, which is what makes it hard to spot.
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