Question

21 is the middle term of an arithemetic sequence how many terms are there in the sequence​

Answer 1

Answer:

21 is the middle term then there will be 41 terms

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Answer 2

Let n be the number of terms of the arithmetic sequence.

Since 21 is the midpoint,

21= (n+1)/2

⇒21x2=n+1

⇒n+1=42

⇒n=42-1=41