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If a_n = 6n + 1, at which term will a_n = 49?

Answer and explanation

Correct answer: आठवाँ

The governing concept is solving an explicit sequence rule for the position n. We need the term whose value is 49, and the rule is aₙ=6n+1. Set the expression equal to the required value: 6n+1=49. Subtract 1 from both sides to obtain 6n=48, then divide by 6 to get n=8. Therefore 49 occurs at the eighth term, so option C is correct. A direct check gives a₈=6(8)+1=48+1=49. The other choices correspond to n=6, 7, and 9, which give 37, 43, and 55 respectively. Solving the equation is more reliable than listing many terms and clearly establishes the unique position.

Related tags

SequencesExplicit-RuleTerm-PositionLinear-SequenceExplicit Or General RuleSequences And ProgressionsMathematicsClass 9 Mcq

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