Discussion
Find the wrong number in the series. 7, 28, 63, 124, 215, 342
Answer: B
Correct answer: 28
Each term should be one less than a cube: \( 2^3-1=7 \), \( 3^3-1=26 \), \( 4^3-1=63 \), \( 5^3-1=124 \), \( 6^3-1=215 \), \( 7^3-1=342 \). The second term is given as 28 where it should be 26, so that is the wrong one.
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