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Class 9 Mathematics Sequences and Progressions Explicit or general ruleHard

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What is the (n)th term of the sequence (31,26,21,16,\ldots)?

Answer and explanation

Correct answer: (a_n=36-5n)

The first term is (31) and the difference is (-5), so (a_n=31+(n-1)(-5)=36-5n). In a decreasing sequence take the common difference as negative.

Related tags

Sequences Progressions Decreasing-Sequence General-Rule Explicit Or General Rule Sequences And Progressions Mathematics Class 9 Mcq

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