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

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If (a_7=29) and (a_{14}=64), what is the value of (a_{21})?

Answer and explanation

Correct answer: (99)

(d=\frac{64-29}{14-7}=5), hence (a_{21}=64+7\times5=99). Equal position gap (7) gives term gap (35).

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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