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Class 10 Mathematics Arithmetic Progressions (AP)Finding the $n$th term of an APMediumLevel 64

In an AP, (a_4=14) and (a_{12}=46). What is the value of (a_{20})?

Answer and explanation

Correct answer: (78)

(d=\frac{46-14}{12-4}=4), so (a_{20}=46+8\times4=78). Moving from the nearest known term is a faster method.

Tags

aptwo-termsnth-termclass10

Frequently asked questions

What is the correct answer to this question?

(78)

Why is this the correct answer?

(d=\frac{46-14}{12-4}=4), so (a_{20}=46+8\times4=78). Moving from the nearest known term is a faster method.

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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