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Answer
GIven sequence,
30, 30, 42, 60, 140, ?
Difference between the first 2 numbers is 1^3 - 1^2 = 0
Difference between the next 2 numbers is 2^3 + 2^2 = 12
Difference between the next 2 numbers is 3^3 - 3^2 = 18
Difference between the next 2 numbers is 4^3 + 4^2 = 80
Difference between the next 2 numbers is 5^3 - 5^2 = 100
So, 140 + 100 =240
