Series and Odd Man out Practice Test 3

Concept:In a wrong-term series, the differences between consecutive terms should follow a consistent pattern.Explanation:Find the consecutive differences:$356-140=216=6^3$$699-356=343=7^3$So the next difference should be $8^3=512$.Thus, the next term should be $699+512=1211$.But the given term is $1221$, which is incorrect.Check the next step: $1211+9^3=1211+729=1940$, which matches the last term.So the pattern is adding consecutive cubes: $6^3,7^3,8^3,9^3,\ldots$Answer:The wrong term is $1221$ (Option B).