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Explicit formulas for arithmetic sequences

Ivy and Andrey were asked to find an explicit formula for the sequence 100,50,0,50,...-100,-50,0,50,...
Ivy said the formula is f(n)=100+50(n1)f(n)=-100+50(n-1).
Andrey said the formula is f(n)=150+50nf(n)=-150+50n.
Which one of them is right?
Choose 1 answer:
Choose 1 answer: