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Class 10 Mathematics Arithmetic Progressions (AP)Finding the $n$th term of an APMediumLevel 66

Find the (18)th term of the AP (84,78,72,\ldots).

Answer and explanation

Correct answer: (-18)

Here (d=-6) so (a_{18}=84+17(-6)=-18). In a decreasing AP take the common difference as negative.

Tags

ap decreasing-ap nth-term class10

Frequently asked questions

What is the correct answer to this question?

(-18)

Why is this the correct answer?

Here (d=-6) so (a_{18}=84+17(-6)=-18). In a decreasing AP take the common difference as negative.

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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