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What is the nth term of the sequence (10, 13, 16, 19, …)?

Answer and explanation

Correct answer: aₙ = 3n + 7

The governing concept is the explicit nth-term formula for an arithmetic sequence. The first term is a₁ = 10, and the common difference is d = 13 − 10 = 3. The formula aₙ = a₁ + (n − 1)d therefore gives aₙ = 10 + (n − 1)3 = 10 + 3n − 3 = 3n + 7. Option A is correct. Verification is straightforward: when n = 1, the formula gives 3 + 7 = 10; when n = 2, it gives 6 + 7 = 13; and when n = 4, it gives 12 + 7 = 19. Option B has an incorrect coefficient, option C gives 4 for n = 1, and option D produces a difference of 1 rather than 3.

Related tags

SequencesArithmetic-SequenceExplicit-FormulaClass-9Nth TermSequences And ProgressionsMathematicsClass 9 Mcq

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