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Find the 17th term of the AP 5, 12, 19, 26, ...

Answer and explanation

Correct answer: 117

The nth-term rule for an AP is aₙ = a + (n − 1)d. From the sequence, the first term is a = 5 and the common difference is d = 12 − 5 = 7; the later differences confirm this value. For the 17th term, substitute n = 17: a₁₇ = 5 + (17 − 1)×7 = 5 + 16×7 = 5 + 112 = 117. Therefore option A is correct. The number 16 appears because there are sixteen equal jumps from the first term to the seventeenth. Option B reflects a smaller multiplication, option C adds one extra increment, and option D does not follow the AP formula. The result can also be checked by continuing the sequence with an increase of 7.

Related tags

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

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