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Which term of the AP 26, 35, 44, … is 206?

Answer and explanation

Correct answer: 21वाँ

The governing idea is the nth-term formula of an arithmetic progression. The first term is a = 26 and the common difference is d = 35 − 26 = 9. If 206 is the nth term, then aₙ = a + (n − 1)d gives 206 = 26 + 9(n − 1). Subtracting 26 yields 180 = 9(n − 1). On division by 9, n − 1 = 20, so n = 21. Therefore 206 is the 21st term and option C is correct. The result can be checked directly: starting with 26, adding 9 twenty times gives 26 + 180 = 206; the initial term has index 1, so twenty increases lead to index 21. Options B and D correspond to one fewer or one more increase, while option A is even farther from the correct position.

Related tags

Arithmetic ProgressionNth-Term EquationTerm NumberSequenceFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)Arithmetic Progressions Ap

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