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Wich term of an arithmetic sequence is -18,given that Asub1=7 and Asub2=2?

Sagot :

Mlcparra16viz
[tex]a_2-a_1=2-7=-5=d[/tex]
The common difference is -5.

[tex]n= \frac{a_n-a_1}{d} +1= \frac{-18-7}{-5} +1=6[/tex]

Therefore -18 is the 6th term.