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IB DIPLOMA · MATH AA, MATH AI & PHYSICS · SL / HL

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Your course. Your level.Math AA · Math AI · Physics
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MATHEMATICS AA · ARITHMETIC SEQUENCES

An arithmetic sequence has u3 = 32 and u4 = 25.

How do I find the common difference?

Start with the change between two terms.

These are consecutive terms, so subtract the earlier term from the next one. What do you get when you subtract 32 from 25?

d = u4 − u3

Your turn: is the sequence increasing or decreasing?

Illustrative responses · Try the modes above

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