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CUET · MATHS · PYQ PAPER 2025

If matrix\(A_p=\left[\begin{array}{ll}p & (p+1) \\ p & (p-1)\end{array}\right], p \in \mathbb{N}\) (where \(\mathbb{N}\) is the set of natural numbers), then the value of \(\left|A_1\right|+\left|A_2\right|+\left|A_3\right|+\cdots+\left|A_{2025}\right|\) is:

  1. A - (2025) (2026)
  2. B \((2025)^2\)
  3. C (2025)(2026)
  4. D \(-(2025)^2\)
Verified Solution

Answer & Solution

Correct Answer

(A) - (2025) (2026)

Step-by-step Solution

Detailed explanation

\(|A_p| = p(p-1) - p(p+1) = p^2-p-p^2-p = -2p\) \(\left|A_1\right|+\left|A_2\right|+\cdots+\left|A_{2025}\right| = \sum_{p=1}^{2025} (-2p)\) \(= -2 \sum_{p=1}^{2025} p = -2 \left(\frac{2025(2025+1)}{2}\right)\) \(= -2025(2026)\)
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