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The AP of multiples of 8 greater than 300 is 304, 312, 320, … . What is its 25th term?

Answer and explanation

Correct answer: 496

This is an nth-term application involving a sequence of multiples. The first term is a₁ = 304 because 300 is not greater than 300, and the first multiple of 8 after it is 304. The common difference is d = 312 − 304 = 8. Using aₙ = a₁ + (n − 1)d, the 25th term is a₂₅ = 304 + (25 − 1) × 8 = 304 + 24 × 8 = 304 + 192 = 496. Hence option A is correct. The strict phrase “greater than 300” rules out 300 as a possible starting value, although 300 is itself not a multiple of 8. Taking 25 rather than 24 steps would produce 504, while changing the starting term or making an arithmetic error can lead to the other distractors.

Related tags

Arithmetic ProgressionNth TermMultiplesFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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