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

If (a_n=2n+5), what are the first term and common difference of the AP?

Answer and explanation

Correct answer: (a=7,d=2)

Putting (n=1), (a_1=7), and consecutive terms differ by (2). In a direct formula, (d) is the coefficient of (n).

Tags

apdirect-formulafirst-termclass10

Frequently asked questions

What is the correct answer to this question?

(a=7,d=2)

Why is this the correct answer?

Putting (n=1), (a_1=7), and consecutive terms differ by (2). In a direct formula, (d) is the coefficient of (n).

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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