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Class 10 Mathematics Arithmetic Progressions (AP)Finding the $n$th term of an APMediumLevel 65

In an AP, (a_5=27) and (a_{13}=67). What is the value of (a_{21})?

Answer and explanation

Correct answer: (107)

(d=\frac{67-27}{13-5}=5) and (a_{21}=67+8\times5=107). Moving from the nearer known term is faster.

Tags

aptwo-known-termsnth-termclass10

Frequently asked questions

What is the correct answer to this question?

(107)

Why is this the correct answer?

(d=\frac{67-27}{13-5}=5) and (a_{21}=67+8\times5=107). Moving from the nearer known term is faster.

Which subject and chapter does this question cover?

This is a Class 10 Mathematics question. Chapter: Arithmetic Progressions (AP). Topic: Finding the $n$th term of an AP.

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