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If (a_n=12n+5), what is the value of (a_7+a_2)?

Answer and explanation

Correct answer: 118

Given \(a_n=12n+5\), \(a_7=12\times7+5=89\) and \(a_2=12\times2+5=29\). Therefore, \(a_7+a_2=89+29=118\), so option A is correct. A value such as 116 can result from a small arithmetic error while adding or multiplying. Exam tip: evaluate each required term separately before adding them.

Related tags

Sequences And ProgressionsNth TermLinear SequenceSubstitutionArithmeticMathematicsClass 9 Mcq

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