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If an AP has (a=4) and (d=7), what is its (5)th term?

Answer and explanation

Correct answer: \(32\)

The formula for the \(n\)th term of an AP is \(a_n=a+(n-1)d\). Substituting \(a=4\), \(d=7\), and \(n=5\), we get \(a_5=4+(5-1)\times7=4+28=32\). Hence, \(32\) is correct. \(35\) would result from adding \(5d\), but the fifth term requires adding only \(4d\). Exam tip: always use \((n-1)d\) for the \(n\)th term.

Related tags

Arithmetic ProgressionNth TermAp FormulaClass 10 MathematicsSequenceFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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