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

In an AP, (a_1+a_2=18) and (d=4). What is (a_{10})?

Answer and explanation

Correct answer: (43)

(a_1+a_2=a+(a+4)=18), so (a=7). Now (a_{10}=7+9\times4=43). First find the first term, then the nth term.

Tags

apfirst-two-termsnth-termclass10

Frequently asked questions

What is the correct answer to this question?

(43)

Why is this the correct answer?

(a_1+a_2=a+(a+4)=18), so (a=7). Now (a_{10}=7+9\times4=43). First find the first term, then the nth term.

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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