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Common Difference means the difference between two numbers.
It is the "common difference".It is the "common difference".It is the "common difference".It is the "common difference".
If the terms get bigger as you go along, the common difference is positive. If they get smaller, the common difference is negative and if they stay the same then the common difference is 0.
yes. A zero common difference represents a constant sequence.
For any index n (>1) calculate D(n) = U(n) - U(n-1). If this is the same for all integers n (>1) then D is the common difference. The sign of D determines whether the common difference is positive or negative.