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What will be the (8)th term of (16,25,36,49,64,\ldots)?

Answer and explanation

Correct answer: 121

The given terms are consecutive perfect squares: \(16=4^2, 25=5^2, 36=6^2, 49=7^2\), and \(64=8^2\). Hence, the \(n\)th term is \((n+3)^2\). Therefore, the \(8\)th term is \((8+3)^2=11^2=121\). Note that \(144=12^2\) is the next, or \(9\)th, term. Exam tip: For such sequences, take square roots of the terms to identify the underlying number pattern.

Related tags

SequencesSquare NumbersNth TermNumber PatternsMathematicsSequences And ProgressionsClass 9 Mcq

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