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If in an AP (a_{4p}=188), (a_p=56), and (d=11), what is the value of (p)?

Answer and explanation

Correct answer: (4)

The direct answer is option B: p = 4. For an AP, the difference between terms whose indices differ by k is kd. The indices 4p and p differ by 4p − p = 3p. Therefore a4p − ap = 3pd. Substitute the given values: 188 − 56 = 132, so 3p × 11 = 132. Hence 33p = 132, and dividing both sides by 33 gives p = 4. Option B is correct. Option A, 3, would give 33 × 3 = 99, not 132. Option C, 5, would give 165, and option D, 6, would give 198; neither matches the given term difference. The calculation assumes the stated AP difference d = 11. Exam cue: subtract the term values, subtract their indices, then use value difference = index gap × common difference.

Related tags

Ap Expert IndexFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)Arithmetic Progressions ApMathematicsClass 10 Mcq

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