what is the twentieth term of the arithmetic sequence 21,18,15,12...?
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what is the twentieth term of the arithmetic sequence 21,18,15,12...?
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Step-by-step explanation:
-30/-33 is the answer
Answer:
a=21,d =18-21=-3 n=20 an=?
an=a+(n-1)d
=21+(20-1)(-3)
=21+19(-3)
=21-57
=-36
20th term of given AP is -36