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What is the first term greater than 1000 in the AP 33, 48, 63, …?

Answer and explanation

Correct answer: 1008

The governing concept is the nth term of an arithmetic progression together with an inequality. The first term is a = 33 and the common difference is d = 48 − 33 = 15. Therefore aₙ = 33 + 15(n − 1). We require the least term greater than 1000, so 33 + 15(n − 1) > 1000. This gives 15(n − 1) > 967 and n − 1 > 64.466..., so the least integer value is n − 1 = 65, or n = 66. The term is a₆₆ = 33 + 65 × 15 = 33 + 975 = 1008. The preceding term is a₆₅ = 993, which is below 1000, confirming that 1008 is the first qualifying term. Hence option B is correct.

Related tags

Arithmetic ProgressionNth TermInequalityAp SequenceFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)Arithmetic Progressions Ap

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