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If (a=2), (d=5), what will be the (15)th term of the AP?

Answer and explanation

Correct answer: 72

The formula for the nth term of an AP is \(a_n=a+(n-1)d\). Therefore, \(a_{15}=2+(15-1)\times5=2+70=72\). Hence, 72 is correct. The option 75 results from incorrectly adding \(15\times5\); only 14 common differences are added to reach the 15th term. Exam tip: always use \((n-1)\), not \(n\), in the nth-term formula.

Related tags

Arithmetic ProgressionNth TermAp FormulaCommon DifferenceClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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