Question 4

Which number will come next in the following series?
5, 12, 31, 68, 129, ..........

Solution

5,12,31,68,129...... implies that

$$1^3+2^2,2^3+2^2,3^3+2^2,4^3+2^2,5^3+2^2,.......$$

So,next term should be $$6^3+2^2=216+4=220.$$

A is correct choice.

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