exam Maths Puzzle Numerical Ability

Its about general terms. I dont get them at ALL!! like one practice problem says find the general term for 8,1,-6,-13,-20. Please help!!

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exam Other Question

On a standard die, the dots on the opposite faces have a sum of 7. How many different sums of dots on three adjacent faces are there on this standard die?

I appreciate any help How many solutions exist for a quadratic equation? How do we determine whether the solutions are real or complex?