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If the fourth term of (7, 7+d, 7+2d, 7+3d) is 34, what is the second term?

Answer and explanation

Correct answer: 16

The fourth term is 7+3d, and it is given to be 34. Set up the equation 7+3d=34. Subtracting 7 gives 3d=27, so d=9. The second term is 7+d, hence it equals 7+9=16. Therefore option D is correct. The full sequence is 7, 16, 25, 34, and each pair of consecutive terms differs by 9, confirming the AP structure. A common error is to divide the total change 34−7 by 4; however, four terms create only three equal gaps, so the correct division is by 3. The governing concept is the standard AP form a, a+d, a+2d, a+3d, where the coefficient of d indicates the number of gaps from the first term.

Related tags

Arithmetic ProgressionCommon DifferenceSecond TermGeneral FormIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions Ap

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