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What is the (n)th term of the sequence (1,4,9,16,\ldots)?

Answer and explanation

Correct answer: (n^2)

The displayed terms are 1, 4, 9, and 16. These are the squares of the counting numbers: \\(1=1^2\\), \\(4=2^2\\), \\(9=3^2\\), and \\(16=4^2\\). This pattern continues, so the term in position \\(n\\) is the square of \\(n\\). In general, this gives \\(a_n=n^2\\).

For example, putting \\(n=1\\) gives 1, putting \\(n=2\\) gives 4, and putting \\(n=4\\) gives 16, exactly matching the sequence. Option A, \\(n^2\\), is therefore correct. The expression \\(2n\\) would describe an even-number pattern, while \\(3n-2\\) gives an arithmetic sequence, so neither reproduces all the given square numbers.

Related tags

SequencesProgressionsNth-TermSquares

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