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

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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.

Related tags

Ap Two-Terms Nth-Term Class10 Finding The $N$Th Term Of An Ap Finding The N Th Term Of An Ap Arithmetic Progressions (Ap)Arithmetic Progressions Ap

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